Edge Collective: Off-grid GPS

2021-10-05 12:29:14

https://www.sparkfun.com/products/15210

schematic for sparkfun project https://cdn.sparkfun.com/assets/3/c/2/2/e/SparkFun_Ublox_SAM-M8Q.pdf

EC project stub: https://github.com/edgecollective/gps

2032 batt holder https://www.digikey.com/en/products/detail/keystone-electronics/3034/4499289

keystone 1060 batt holder for 2032 https://www.digikey.com/en/products/detail/keystone-electronics/1060/303556

keystone 1058 batt holder https://www.digikey.com/en/products/detail/keystone-electronics/1058/5255484

compass https://learn.adafruit.com/lsm303-accelerometer-slash-compass-breakout/downloads


2021-10-13 14:15:47

Neo-6M module https://create.arduino.cc/projecthub/ruchir1674/how-to-interface-gps-module-neo-6m-with-arduino-8f90ad

gps + compass https://www.amazon.com/dp/B078Y6323W/ref=sspa_dk_detail_0?psc=1&pd_rd_i=B078Y6323W&pd_rd_w=aGiBN&pf_rd_p=54ed5474-54a8-4c7f-a88a-45f748d18166&pd_rd_wg=WPpic&pf_rd_r=H40Q96B44260656MZAJC&pd_rd_r=aafb6106-3094-419c-a62e-49b3e5661f3f&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFBTUc2Tjc4MFFVRlUmZW5jcnlwdGVkSWQ9QTA5NjMzMTFON1czTTBVREgyVEkmZW5jcnlwdGVkQWRJZD1BMTAzOTc4MjRFWlpYQkJSMzJYSCZ3aWRnZXROYW1lPXNwX2RldGFpbF90aGVtYXRpYyZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=


2021-10-13 15:22:33

neo-6m black pinout


2021-10-29 15:49:19

beitan gps + compass widget https://www.amazon.com/dp/B078Y6323W

pinout:

repo with previous 'compass experiments' -- https://github.com/edgecollective/compass-experiments


2021-11-18 13:01:19

Going to keep going by working on dc4 https://github.com/edgecollective/dog-compass

Switching over to the feather sense -- has on-board compass + accel -- https://learn.adafruit.com/adafruit-feather-sense

DC4 uses 10DOF breakout, gets compass and gps readings ...

basing DC5 off of 10DOF, and this code: https://github.com/edgecollective/compass-experiments/blob/main/ver_0.4-alpha/base_featherm0_i2c_compass_oled_lora/base_featherm0_i2c_compass_oled_lora.ino

DC5 can now do the compass thing. https://github.com/edgecollective/dog-compass/tree/c405d9c2479334dbd5f5723fbf30fd0d8ae008ed/dc5

remote (r1) is based directly off this code: https://github.com/edgecollective/compass-experiments/blob/main/ver_0.4-alpha/remote_featherm0/remote_featherm0.ino


2021-11-19 08:08:38

How to calibrate the 10DOF / 9DOF sensor ...


2021-11-19 11:51:13

MIT App inventor

http://iot.appinventor.mit.edu/assets/tutorials/MIT_App_Inventor_Basic_Connection.pdf

Example codes for receiving text https://community.appinventor.mit.edu/t/ble-esp32-bluetooth-send-receive-arduino-ide-multitouch/1980/7


2021-11-19 12:30:48

https://www.reddit.com/r/esp32/comments/q3jm20/advice_on_pushing_gps_positions_from_esp32_to/

https://github.com/Buffalchill/ESP32-BLE-Appinventor2

https://arduinoplusplus.wordpress.com/2017/05/23/reliable-bluetooth-le-comms-between-arduino-and-mit-app-inventor-ai2/

https://github.com/RuiSantosdotme/ESP32-Course/tree/master/code


2021-11-19 13:19:29

Below example apk worked:

https://github.com/dwblair/ESP32-Course

Associated post to extend to two values, here: https://rntlab.com/question/esp32-ble-to-mit-app/


2021-12-02 12:44:58

This device now in stock:

https://www.adafruit.com/product/4413

Great post on magnetic sensor calibration: https://learn.adafruit.com/adafruit-sensorlab-magnetometer-calibration


2021-12-02 13:15:00

Okay, looks like this is the GPS module to work with for now:

https://www.amazon.com/Microcontroller-Compatible-Sensitivity-Navigation-Positioning/dp/B07P8YMVNT/ref=sr_1_3?keywords=gps%2Barduino&qid=1638468855&sr=8-3&th=1

The LSM303 module via amazon: https://www.amazon.com/HiLetgo-LSM303DLHC-Compass-Accelerometer-Magnetometer/dp/B07X3GFKYD/ref=sr_1_5?keywords=magnetometer+accelerometer&qid=1638469212&sr=8-5

LSM303 flora: https://www.amazon.com/Adafruit-Flora-Accelerometer-Compass-Sensor/dp/B00OKJFELC

LSM303 via adafruit STEMMA: https://www.adafruit.com/product/4413

LSM303 in some random Amazon package: https://www.amazon.com/HiLetgo-LSM303DLHC-Compass-Accelerometer-Magnetometer/dp/B07X3GFKYD/ref=sr_1_1?keywords=LSM303&qid=1638470322&sr=8-1


2021-12-06 15:18:49

M0 wake from interrupt code example: https://github.com/ProjectsByJRP/M0_Sleep_External_Int

Also: the RTCZero library is available

This seems to be the edge-mount SMA part: https://www.digikey.com/en/products/detail/samtec-inc/SMA-J-P-H-ST-EM1/2602450

Appropriate lora antenna on Digikey: https://www.digikey.com/en/products/detail/seeed-technology-co.,-ltd/318020389/15277460?utm_adgroup=RF%20Antennas&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_RF%2FIF%20and%20RFID_NEW&utm_term=&utm_content=RF%20Antennas&gclid=CjwKCAiAhreNBhAYEiwAFGGKPACMhG_iZ7Z5NfBJH9PoIr5wcTi-rGeWcapD-65skeYaGehZQl5PVhoCm2UQAvD_BwE

QT to male header cable on adafruit: https://www.adafruit.com/product/4209

horiztonal JST 4 pin connector / stemma https://www.adafruit.com/product/4392 -- hor

vertical (through-hole) JST 4 pin connector: https://www.adafruit.com/product/4390 -- even nicer! use this on CO2!

adafruit monochrome OLED 128x64 that works with stemma -- nice find! https://www.adafruit.com/product/326

image transfer, bluetooth BLE https://learn.adafruit.com/bluefruit-le-connect/image-transfer

tile downloader via OSM: https://wiki.openstreetmap.org/wiki/OpenLayers_Local_Tiles_Example

downloading tiles https://help.openstreetmap.org/questions/43792/can-i-download-osm-tiles-for-offline-use

openmaptiles https://openmaptiles.org/

create vector tiles from openstreetmap https://openmaptiles.org/docs/generate/generate-openmaptiles/

openlayers with tile coords for debugging https://openlayers.org/en/latest/examples/canvas-tiles.html


2021-12-07 10:51:27

Adafruit TFT display I have for testing: https://www.adafruit.com/product/358

Associated product tutorial: https://learn.adafruit.com/1-8-tft-display/downloads

imagemagick create 24 bit bitmap:

convert 2color.bmp -type truecolor 24bit.bmp

resize:

convert dragon_sm.gif -resize 64x64

If use '^', it will fill the image based on smallest dimension:

convert dragon_sm.gif -resize 64x64^

Simple plotting code using Adafruit graphics library:

https://forum.arduino.cc/t/another-free-graph-function-for-plotting-in-cartesian-space/354751

Waveshare display https://www.amazon.com/gp/product/B0728BJTZC/ref=sw_img_1?smid=&psc=1


2021-12-24 12:25:22

gps module pinout

working version as of today:

https://github.com/edgecollective/dog-compass/tree/9dd1343122612f8e2b601ca395b1c6348577246c/v3


2021-12-29 14:48:24

Kicad layout ver4 / 'base_a' https://github.com/edgecollective/dog-compass/tree/3671ac027cc06751b30f98f3e344d27f657715df/v4/hardware/base_a/kicad


2021-12-29 21:13:27

Basic layout with sharp screen placement and gps 'stalk':

https://github.com/edgecollective/dog-compass/tree/5e5f83493c11156845356251b360087a64f98a79/v4

To do:


2021-12-30 12:38:49

For now, going to go with this version of the GPS module:

https://www.amazon.com/dp/B01D1D0F5M

Cheap, large antenna, and flat back for taping


2022-01-03 16:31:03

Note: the BNO005 IMU has 'suspend' capability in adafruit arduino library --

https://github.com/adafruit/Adafruit_BNO055/blob/master/Adafruit_BNO055.cpp#L791

-- so let's just connect it to 3V & GND, don't put it on mosfet as yet

apparently suspend should use 0.04 mA (40 uA?), cf https://cdn-shop.adafruit.com/datasheets/BST_BNO055_DS000_12.pdf


2022-01-04 12:09:11

Adafruit edge-launch connector: https://www.adafruit.com/product/1864

Note: requires a .8mm thickness board. Should we go with through-hole instead?

Maybe no: for simpler antennas, better to have ability to just go 'straight out' ... (although could have right-angle through-hole ...)

Through-hole might be safer for now -- amphenol part that seems to work: https://www.digikey.com/en/products/detail/amphenol-rf/132136RP/1011910?s=N4IgjCBcoLQBxVAYygMwIYBsDOBTANCAPZQDa4YArCALoC%2BdhATGeAMxNhsBsASgAq06QA

eep! $11 on digikey!

okay, more specs:

Maybe edge-mount is better in terms of price ...

Okay Amphenol 132134 -- vertical, through-hole, SMA is $5 on digikey: https://www.digikey.com/en/products/detail/amphenol-rf/132134/1011907?utm_adgroup=Connectors%20and%20Interconnects&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Supplier_Amphenol%20RF_0115_Co-op&utm_term=&utm_content=Connectors%20and%20Interconnects&gclid=Cj0KCQiA_c-OBhDFARIsAIFg3exWn5x0L7IgpDIH9tc9GQhpB8LEb58bqIZu1k5v-SAiMrYhqyfy_aIaAu0iEALw_wcB

$5 Molex edge-launch 0732511150 SMA: https://www.digikey.com/en/products/detail/molex/0732511150/1465156; datasheet: https://www.molex.com/pdm_docs/sd/732511150_sd.pdf

looks like it would accommodate 1.6 mm thickness board ...

Molex 0733910083 SMA-RA right-angle through-holde, cheap -- $4 -- https://www.digikey.com/en/products/detail/molex/0733910083/9740783

check footprint: same as prior -- seems standard through-hole footprint --

Verdict: let's do through-hole for now to eliminate variable of board thickness


2022-01-05 13:44:48

Pinout assignments

A0 Free / optional lorawan A1 Speaker A2 Button A A3 Button B A4 Button C A5 Write Permit

D0 RX D1 TX D5 Sharp Display D6 LoRa RST D9 GPS Power Switch D10 free (so that we can use microsd breakout) D11 LoRa CS D12 LoRa IRQ D13 free

Submitted to JLCPCB 5-JAN-2021: version 4 of 'tracker' v 0.1

https://github.com/edgecollective/dog-compass/tree/1715f4772cc23040eaecd5674919c41211422053/v4/hardware/base_b/kicad

scavenger hunt

https://earth.google.com/web/search/23+Conant+Road,+Lincoln,+MA/@42.41195031,-71.29780961,60.10623401a,201.46198822d,35y,-15.43062123h,0.43027734t,0r/data=CigiJgokCQD_c9EGN0VAEa9z9t8aNEVAGZfvq4v_0VHAITsSNA681FHA


2022-01-07 13:17:37

CUI SMT buzzer options:

https://www.digikey.com/en/products/detail/cui-devices/CSS-0575A-SMT-TR/2364642

Nice article on buzzers https://www.cuidevices.com/blog/buzzer-basics-technologies-tones-and-driving-circuits

good guide to rp-sma vs sma https://www.spo-comm.de/en/blog/know-how/what-is-the-difference-between-sma-and-rp-sma

adafruit uses rp-sma antennae, so that's what we'll go with


2022-01-08 13:26:21

match container -- https://www.amazon.com/Alltrapod-Large-Capacity-Containers-Bundle/dp/B07WHV6QDP/ref=asc_df_B07WHV6QDP/?tag=&linkCode=df0&hvadid=385115658454&hvpos=&hvnetw=g&hvrand=3636123725976048146&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001876&hvtargid=pla-862591379194&ref=&adgrpid=78796009375&th=1

3 7/8 " by 1 1/8 "

5 x 3 in plastic container https://www.amazon.com/HUELE-Waterproof-Shockproof-Airtight-Container/dp/B076T9V97B/ref=sr_1_8?crid=2YLXIOJKUXZ0Z&keywords=waterproof%2Bcamping%2Bpouch%2Bplastic&qid=1641670849&sprefix=waterproof%2Bcamping%2Bpouch%2Bplastic%2Caps%2C53&sr=8-8&th=1

5 pack clear cosmetics bag https://www.amazon.com/Cosmetics-Wobe-Organizing-Waterproof-Organizer/dp/B07C1P1LMN/ref=sr_1_24?crid=2YLXIOJKUXZ0Z&keywords=waterproof+camping+pouch+plastic&qid=1641670849&sprefix=waterproof+camping+pouch+plastic%2Caps%2C53&sr=8-24

PVC pencil case https://www.amazon.com/Xgood-Zippered-Toiletry-Capacity-Portable/dp/B07SG86Z9X/ref=pd_day0fbt_img_1/140-5573154-8774608?pd_rd_w=JTux5&pf_rd_p=bcb8482a-3db5-4b0b-9f15-b86e24acdb00&pf_rd_r=3JE1N7KR74ZFSGSYKT4F&pd_rd_r=17735ec6-3a0c-49e5-9a2d-f61011cdb18b&pd_rd_wg=blNcJ&pd_rd_i=B07SG86Z9X&th=1

small plastic zip document bag w/ string https://www.amazon.com/dp/B07BRYMSM6/ref=sspa_dk_detail_7?psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFVME4wOUlBRlJYUDImZW5jcnlwdGVkSWQ9QTEwMzg1MzExME02VDBKSFBBMTNOJmVuY3J5cHRlZEFkSWQ9QTAxODE3NzEzT1FWSFNaOTlNMTJMJndpZGdldE5hbWU9c3BfZGV0YWlsMiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

plastic pouch with holes

https://www.amazon.com/dp/B07RC79KYS/ref=sspa_dk_detail_0?pd_rd_w=sgMiO&pf_rd_p=54ed5474-54a8-4c7f-a88a-45f748d18166&pd_rd_wg=eodH7&pf_rd_r=85R3QKXRNJJ4X65AWCZG&pd_rd_r=38bb9236-f594-40c9-8484-78a038d6c367&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUFFRVUwVlZaTk1VVzgmZW5jcnlwdGVkSWQ9QTAyNzc0ODAyWThKRlNGOUhGV0s1JmVuY3J5cHRlZEFkSWQ9QTAwMjEyMjdSNVdGTVpRMjlYMTImd2lkZ2V0TmFtZT1zcF9kZXRhaWxfdGhlbWF0aWMmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl&th=1


https://www.amazon.com/LABUK-Pencil-Zipper-School-Storage/dp/B08GS97MMR/ref=sr_1_6?keywords=plastic%2Bpencil%2Bcase%2Bstrap&qid=1641671460&sr=8-6&th=1


2022-01-08 21:34:19

Boards ordered for remote node


2022-01-11 09:28:54

Adding a clicky marker to Leaflet https://gis.stackexchange.com/questions/172508/add-an-event-listener-on-a-marker-in-leaflet/172586


2022-01-12 14:26:09

Revised header for sharp display -- sent in tracker ver 0.2:

https://github.com/edgecollective/dog-compass/tree/ca2bd9620cc31ee5a6c63c52db3a900ba1eb024b/tracker_v_0.2

JLCPCB Order #: Y47-2489114A 2022-01-13 (china time)

"the other rule of thumb for 3D printed cases with heat-set inserts for your PCB mounting holes--I want ideally a 8mm circle with no components on either side, centered on each mtg hole."


2022-01-13 12:06:20

Through hole slide switch right angle: https://www.digikey.com/en/products/detail/c-k/OS103011MA7QP1/1981432

ideal -- through hole slide switch right angle (out of stock): https://www.digikey.com/en/products/detail/e-switch/EG1270/6076

good one to go with:

EG_1213

https://www.digikey.com/en/products/detail/e-switch/EG1213/101735

similar alternative:

C&K OS102011MA1QN1

https://www.digikey.com/en/products/detail/c-k/OS102011MA1QN1/1981430

https://www.digikey.com/en/products/detail/apem-inc/MHSS1105/1949465


2022-01-13 12:51:15

Nice reference for sharp display: https://learn.adafruit.com/circuitpython-display-support-using-displayio/ui-quickstart

gps -- make piezo a through-hole buzzer -- use right angle switch -- all ports on one side ...

would be nice to have a buzzer on the remote node, just to have a 'buzzer badge'

update: test piezo when it arrives, for loudness ... then add / or not


2022-01-18 17:10:31

Button pressing in circuitpython https://learn.adafruit.com/multi-tasking-with-circuitpython/buttons

Circuitpython debouncer library: https://learn.adafruit.com/debouncer-library-python-circuitpython-buttons-sensors/

library repository: https://github.com/adafruit/Adafruit_CircuitPython_Debouncer


2022-01-21 22:23:15

latest 'trace.py' code will show latest 100 datapoints https://github.com/edgecollective/dog-compass/blob/28695531aa75c3c57e9ae1f70cf4403398ea132d/tracker_v_0.2/firmware/CPY/v5/trace.py

note: the labels on the switches need to be updated, they're covered currently ...


2022-01-22 20:56:09

Testing IMU on tracker 0.2 ...

https://learn.adafruit.com/adafruit-bno055-absolute-orientation-sensor/python-circuitpython?gclid=CjwKCAiA866PBhAYEiwANkIneOXNnFsFH7Ze19fHe8GXVNl8cL2wZGaBEhDoZfnJrhVcmaFCj2RVnxoCz7IQAvD_BwE

via https://github.com/adafruit/Adafruit_CircuitPython_BNO055/blob/cd0f90659517b0682252fe534b1a28e9424c5dfd/adafruit_bno055.py#L354

    @property
    def calibration_status(self):
        """Tuple containing sys, gyro, accel, and mag calibration data."""
        calibration_data = self._read_register(_CALIBRATION_REGISTER)
        sys = (calibration_data >> 6) & 0x03
        gyro = (calibration_data >> 4) & 0x03
        accel = (calibration_data >> 2) & 0x03
        mag = calibration_data & 0x03
        return sys, gyro, accel, mag

2022-01-24 12:20:44

Magnetic declination at 10 Conant Rd, Lincoln, MA

via: https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml

Datasheet for bno-005 bosch absolute sensor https://cdn-shop.adafruit.com/datasheets/BST_BNO055_DS000_12.pdf


2022-01-27 16:29:5

Latest circuitpython setup:

dog-compass/tracker_v_0.2/firmware/CPY/v5/base_gps_radio.py on the base,

and

dog-compass/node_v_0.1/firmware/CPY/v5/gps_radio.py on the remote

unfortunately, can't do sufficient math in circuitpython, because don't have the floating point precision

switching to arduino!


2022-01-27 21:37:06

have radio, gps, and imu ... and comm from remote node ... up and running!

need to test angle, and add graphics, next ...


2022-01-29 21:39:40

Working pair of remote node and tracker:

Remote node (v_0.1): https://github.com/edgecollective/dog-compass/tree/c831426e3f56c6998b5059f3d2dd5fc5f9f557b8/node/node_v_0.1/firmware/arduino/v1/remote

Base / Tracker node (v_0.2): https://github.com/edgecollective/dog-compass/tree/c831426e3f56c6998b5059f3d2dd5fc5f9f557b8/tracker/tracker_v_0.2/firmware/arduino/v1/base


2022-02-02 14:26:42

Issue with floating point precision in python perhaps resolved with Decimal class ...

Adafruit GPS library for Circuitpython https://github.com/adafruit/Adafruit_CircuitPython_GPS

started gps experiment at 1500 on FEB 2

from dual_gps.txt ...

note that the green line -- which is running circuitpython -- seems relatively discretized ...


2022-02-03 13:05:18

42.41222395647637, -71.29805764333454

converting incoming nema to degrees:

https://forums.raspberrypi.com/viewtopic.php?t=175163

Lat : 3137.36664 becomes 31 degrees and 37.26664 seconds = 31 + 37.36664/60 = 31.6227773 Lon : 00212.21149 becomes 2 degrees and 12.21149 seconds = 2 + 12.21149/60 = 2.20352483

Note: in below figure, the 'base' node has the smaller gps antenna ..

via https://github.com/edgecollective/dog-compass/blob/main/tracker/tracker_v_0.2/firmware/CPY/v6/analysis/


2022-02-03 19:58:37

Signal strength vs distance

Plotting code used: https://github.com/edgecollective/dog-compass/blob/1aa356f5e9fd41f634622cdf9d10ee23f7e90a0a/tracker/tracker_v_0.2/firmware/arduino/analysis/pydist.py

Dataset: https://github.com/edgecollective/dog-compass/blob/1aa356f5e9fd41f634622cdf9d10ee23f7e90a0a/tracker/tracker_v_0.2/firmware/arduino/analysis/output.txt

Using this code on the 'base' node, which outputs the proper strings https://github.com/edgecollective/dog-compass/tree/1aa356f5e9fd41f634622cdf9d10ee23f7e90a0a/tracker/tracker_v_0.2/firmware/arduino/v1/base

And is read in by this code: https://github.com/edgecollective/dog-compass/blob/1aa356f5e9fd41f634622cdf9d10ee23f7e90a0a/tracker/tracker_v_0.2/firmware/arduino/analysis/readline.py

3d plot:

Generated using this code: https://github.com/edgecollective/dog-compass/blob/1aa356f5e9fd41f634622cdf9d10ee23f7e90a0a/tracker/tracker_v_0.2/firmware/arduino/analysis/3dplot.py


2022-02-05 18:19:10

Enclosure design

https://hackaday.com/2017/05/24/practical-enclosure-design-optimized-for-3d-printing/

https://hackaday.com/2020/11/16/simple-tips-for-better-3d-printed-enclosures/

https://hackaday.com/2021/12/12/customize-these-3d-printed-cases/

https://willem.aandewiel.nl/index.php/2022/01/02/yet-another-parametric-projectbox-generator/

https://hackaday.com/2022/01/31/this-parametric-project-box-generator-is-super-easy/

Prusa 3D Printer https://www.prusa3d.com/category/original-prusa-mini/


2022-02-05 20:42:43

GPS mapper notebook

Folium docs https://python-visualization.github.io/folium/quickstart.html#Getting-Started

Online jupyter notebook: https://jupyterlite.readthedocs.io/


2022-02-11 22:44:28

color-coded by distance:


2022-02-19 08:40:02

High-accuracy GPS from Sparkfun: https://learn.sparkfun.com/tutorials/gps-rtk2-hookup-guide?_ga=2.9331189.1546501649.1645193699-1617606000.1645193699

Connecting to a correlation source https://learn.sparkfun.com/tutorials/gps-rtk-hookup-guide/all#connecting-the-gps-rtk-to-a-correction-source


2022-02-20 14:02:47

Memory management tips in circuipython:

https://learn.adafruit.com/Memory-saving-tips-for-CircuitPython?view=all

14K log file for gps data had 523 lines ... that's about 26 bytes per line ...

looks like we have about 100K free now ... so that's about 3800 lines we could save .. at 10 second measurement intervals, that's 60 hours of measurements


2022-02-20 18:33:06

https://learn.adafruit.com/adafruit-9-dof-orientation-imu-fusion-breakout-bno085/overview

using lora w sd card -- looks like we can basically just use the CS pin to deselect radio before using SD card

https://forums.adafruit.com/viewtopic.php?f=24&p=860057


2022-02-21 18:43:18

https://github.com/helscream/HMC5883L_Header_Arduino_Auto_calibration

http://arduino-er.blogspot.com/2015/04/hmc5883l-library-with-calibration-for.html

compass: https://www.amazon.com/HiLetgo-LSM303DLHC-Compass-Accelerometer-Magnetometer/dp/B07X3GFKYD/ref=pd_sbs_6/138-1407279-7301129?pd_rd_w=t2ppy&pf_rd_p=cd718a0c-f7e0-41b6-9f23-6496d85d1998&pf_rd_r=87P8WT7H01PBMNK2BXZ3&pd_rd_r=accb5e3b-b23a-4d50-b181-c2654e22539e&pd_rd_wg=oWbGx&pd_rd_i=B07X3GFKYD&psc=1


2022-02-22 19:59:47

Sparkfun tutorial on compass calibration https://www.youtube.com/watch?v=k6ccH8QYGK8


2022-02-24 12:08:25

LSM303DLHC

https://www.amazon.com/gp/product/B07X3GFKYD/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

https://learn.adafruit.com/lsm303-accelerometer-slash-compass-breakout/which-lsm303-do-i-have

Calibration code: https://learn.adafruit.com/lsm303-accelerometer-slash-compass-breakout/calibration

Mag Minimums: -75.91 -90.00 -26.12 Mag Maximums: 68.45 46.55 130.82


2022-02-24 12:54:33

This library works with the above lsm303 module:

https://github.com/pololu/lsm303-arduino

min: { -668, -761, -23} max: { +586, +422, +1034}


2022-03-16 17:30:56

2xAA batt holder w/ pins

https://www.digikey.com/en/products/detail/keystone-electronics/2462/303811?utm_adgroup=Battery%20Holders%2C%20Clips%2C%20Contacts&utm_source=google&utm_medium=cpc&utm_campaign=Shopping_Product_Battery%20Products&utm_term=&utm_content=Battery%20Holders%2C%20Clips%2C%20Contacts&gclid=CjwKCAjwlcaRBhBYEiwAK341jRhEGQ0uyRPSVyDlmogaa_Mf_BZ1VOkiVM709NKaRai1PNAmbPH61BoCRXwQAvD_BwE

https://www.keyelco.com/userAssets/file/M65p28.pdf

https://www.section.io/engineering-education/how-to-build-a-real-time-location-tracker-using-leaflet-js/