new hardware approach

[caseywdunn]

One wire temp sensors not reliable enough. Also clear that need battery and cell service.

Got the following:

Thermocouple

• https://www.adafruit.com/product/3245 - K thermocouple
• https://learn.adafruit.com/adafruit-max31856-thermocouple-amplifier amplifier
• https://learn.adafruit.com/thermocouple/ - instructions

Ambient

• https://www.adafruit.com/product/385 temp, humidity

Display

• https://www.ebay.com/itm/DIYmall-Yellow-and-Blue-0-96-Inch-IIC-Serial-128X64-OLED-Display-LCD-Module/272675577262?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
• Looks to be similar to https://www.adafruit.com/product/938
• Can be driven by this code https://github.com/adafruit/Adafruit_SSD1306

Particle

• Mesh network overview - https://www.particle.io/mesh/
• Boron - https://docs.particle.io/datasheets/cellular/boron-datasheet/
• LiPo battery LP103450 https://store.particle.io/collections/accessories

[caseywdunn]

Wiring the thermocouple. More here:

https://community.particle.io/t/max31856-example-for-particle/38385/4

and here:

https://learn.adafruit.com/adafruit-max31856-thermocouple-amplifier/wiring-and-test

[caseywdunn]

For ambient sensor, library is here:

https://github.com/adafruit/DHT-sensor-library

Example code is here:

https://github.com/jogleasonjr/particle-dht22/blob/master/particle-dht22.ino

[caseywdunn]

Here is an example of using that display - http://hamradiodesigns.com/index.php/hardware/150-w-dummy-load/

Code is available at the bottom of here - http://hamradiodesigns.com/index.php/content/

That code is using I2C on Arduino pins A4 and A5, per https://www.arduino.cc/en/reference/wire .

On particle, this example uses D0 and D1. See OLED https://docs.particle.io/support/particle-devices-faq/i2c-faq/

Code for that example is at https://build.particle.io/shared_apps/5a1d9e5310c40e5c02001232 . It uses the Adafruit_BME280_RK and Adafruit_SSD1306_RK libraries.

[caseywdunn]

This configuration uses a lot of pins because every external device is using a different protocol. SPI devices are available for all items. Nice overview of SPI here - https://www.analog.com/en/analog-dialogue/articles/introduction-to-spi-interface.html

Devices each need their own CS pin, but share the other 3.

Particle has built in spi support - https://docs.particle.io/reference/device-os/firmware/photon/#spi

More here on using multiple SPI devices with particle - https://community.particle.io/t/spi-ss-and-more-than-1-spi-peripheral/14791/13

Here is an example of using native particle SPI support for the thermocouple board - https://community.particle.io/t/max31856-example-for-particle/38385

[caseywdunn]

SPI pin mapping/ names:

SCLK : SCK, CLK. MOSI : SIMO, SDO, DO, DOUT, SO, MTSR. MISO : SOMI, SDI, DI, DIN, SI, MRST. SS : nCS, CS, CSB, CSN, nSS, STE, SYNC.

from https://forum.pjrc.com/threads/24993-SPI-Data-in-out-naming-clarity

[caseywdunn]

SPI use of LCD backpack - https://learn.adafruit.com/i2c-spi-lcd-backpack/arduino-spi-use

Looks like the library is not compatible with hardware SPI: "This library does not use the Hardware SPI library, which means you can use any 3 pins! However, if you are using the hardware SPI port (such as for Ethernet, WiFi, an LCD, etc. etc) you cannot share those pins with this LCD!"

[caseywdunn]

Display is not working.

Was completely garbled. Adding reset wire led to top half working, but lower half is still garbled. This may be relevant:

https://github.com/olikraus/u8g2/issues/264