Table of Contents

Karmon communication prototocl
- What needs to be communicated
- Payloads

Karmon communication prototocl

What needs to be communicated

RPM
- Every .5 secs
- No Ack
Motor Temp
- Every minutes or when peaks are reached
- No Ack
Battery cells voltages
- Whenever updated
- No Ack
Lap count trigger (From remote to car)
- Each time button is pressed
- No Ack
New lap (from kar to screen)
- Each time detected
- No Ack

Payloads

Representation

lowercase means bit
Uppercase means byte
letter link to description
example :
- [ttttRR] means 4 bits for message type followed by 2 bytes for rpm.

Message types

RPM : [0001RR]
- 4 bits for message type
- 2 bytes for RPM (unsigned int)

Motor Temperature : [0010TT]
- 4 bits for message type
- 2 bytes for temperature (unsigned int = T*100)

Cell voltage : [0011(nnnV){1,8}]
- 4 bits for message type
- repetition of 1 to 8 times
  - 3 bits for cell number
  - 1 byte for voltage (unsigned char = (V-2.5) * 100)
    - Range from 2.5V to 5V with 2 digit precision
Lap Trigger : [0100]
New Lap : [0101]