Getting started with A0?

General Discussion
#1

seems my project is simple yet unique enough that I don’t know where to start.
I’d like to use my Macchina A0 to read known standard and Torque app format PIDs from OBD2 and transmit with ESP-NOW to a ESP8266 driving a display as a stand alone gauge.
the car is a’19 mazda mx5. the ESP8266 /display is installed and up and running doing other stuff already (roof control, ethanol sensor display, passenger airbag warning display, generic menu and 2 button user interface ) I’m comfortable with the display side of things, ish.
I’d like to start with coolent temp or rpm since it’s verifiable and a universal obd2 code and I can find in the right format (whatever the format is since I’m not sure where to start)
this would let me focus on the ESP-NOW and receive/display side of things.
the main thing I want to figure out is tire pressures. this is the Torque setting list. I don’t know how to format it for use for my purpose but I suspect all the info is there

pid: 222A05
name: Tire 1 Pressure
sName: T1Press
Min: 0
Max: 50
Scale: x1
Unit: psi
Equation: ((A * 1373) / 1000) * 0.145037738
Header: 720

pid: 222A06
name: Tire 2 Pressure
sName: T2Press
Min: 0
Max: 50
Scale: x1
Unit: psi
Equation: ((B * 1373) / 1000) * 0.145037738
Header: 720

pid: 222A07
name: Tire 3 Pressure
sName: T3Press
Min: 0
Max: 50
Scale: x1
Unit: psi
Equation: ((C * 1373) / 1000) * 0.145037738
Header: 720

pid: 222A08
name: Tire 4 Pressure
sName: T4Press
Min: 0
Max: 50
Scale: x1
Unit: psi
Equation: ((D * 1373) / 1000) * 0.145037738
Header: 720

pid: 222A0A
name: Tire 1 Temp
sName: T1Temp
Min: 0
Max: 200
Scale: x1
Unit: F
Equation: (9/5 * (A - 50)) + 32
Header: 720

pid: 222A0B
name: Tire 2 Temp
sName: T2Temp
Min: -50
Max: 200
Scale: x1
Unit: F
Equation: (9/5 * (B - 50)) + 32
Header: 720

pid: 222A0C
name: Tire 3 Temp
sName: T3Temp
Min: -50
Max: 200
Scale: x1
Unit: F
Equation: (9/5 * (C - 50)) + 32
Header: 720

pid: 222A0D
name: Tire 4 Temp
sName: T4Temp
Min: -50
Max: 200
Scale: x1
Unit: F
Equation: (9/5 * (D - 50)) + 32
Header: 720

any first step direction/ help would be much appreciated.

#2

there is a lot of info missing about the A0
bluetooth is turned off by default when it ships and has to be turned on in the settings via serial monitor.
any custom sketch has to include pins held low to power the RGB and to enable the transceiver to work as listed in the schematic, the example projects don’t work.
I finally have communication with it but dang! the info in getting started is just plain wrong!!
the best advice : look at the schematics and SavvyCAN code to figure it out, whoever wrote the getting started pages never used the A0
I posted corrected code in the example for coolent temp rpm mph and manifold pressure that actually works.

#3

BTW the answer to my question is this piece of info: https://en.wikipedia.org/wiki/OBD-II_PIDs#CAN_(11-bit)_bus_format

Torque PID to CAN frames:
id = 0x720
byte0 = 3 3 bytes following (this is inferred from PID. 4digits is 2, 6 digits is 3.
byte1 = 22 custom service OBD request byte
byte2 = 2A requested PID
byte3 = 05 ,etc, requested PID
byte4-7 = 0x00

put this in SavvyCAN and look for the response frames
response will be
CAN frame
id = ? id the response returns on(mine was 0x728)
byte0 = 4+ however many bytes returned
byte1 = ? custom service response byte (mine was 0x62)
byte2 = 2A PID
byte3 = 05, etc, PID
byte4+ = data bytes
remaining bytes 0x00