RDing TEMPer

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RDing TEMPer

The RDing TEMPer is a USB-based temperature logger.

See RDing TEMPer/Info for more details (such as lsusb -vvv output) about the device.

Hardware

I2C, USB, LED
I2C/USB closeup
  • Main chip: Unknown, yet (markings were removed)
  • Temperature sensor: Fairchild FM75 (datasheet), I2C slave addres 0x4f
  • I2C EEPROM: Unknown, yet (markings were removed), I2C slave addres 0x50
  • Oscillator: 6MHz

Main chip pinout:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
SCL SDA 5V/high 5V/high 5V/high 5V/high GND 5V/high 3.3V Oscillator Oscillator 5V/high USB D- USB D+ LED (5V) 5V 3.3V 3.3V

I2C EEPROM pinout:

1 2 3 4 5 6 7 8
GND GND GND GND SDA SCL GND 3.3V

See these example sigrok captures for the I2C, USB, and LED traffic going on while the device is queried from the PC (see also screenshots on the right-hand side).

Example usage:

$ sigrok-cli -i rding_temper_i2c_usb_led_sensor_5s.sr -a i2c:sda=0:scl=1
i2c: "START" 
i2c: "ADDRESS READ" "0x4f" 
i2c: "ACK" 
i2c: "DATA READ" "0x1d" 
i2c: "ACK" 
i2c: "DATA READ" "0x80" 
i2c: "ACK" 
i2c: "STOP" 
$ sigrok-cli -i rding_temper_i2c_usb_led_sensor_5s.sr -a usb:dm=3:dp=4:signalling=low-speed
usb: "SYNC INVALID!" "001001001100100" 
usb: "SYNC INVALID!" "000000000000110000000111111100100000000010001" 
usb: "SYNC INVALID!" "0000000000011100000011000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000111111001000101111" 
usb: "SYNC INVALID!" "000000000000001001000010011" 
usb: "OUT DEV 47 EP 0" "00000001100001111111010000001001" 
usb: "DATA1 00 00 00 00 00 00 00 00 " "000000011101001000000000000000000000000000000000000000000000000000000000000000001111110100101111" 
usb: "SYNC INVALID!" "00000000101001011" 
usb: "OUT DEV 47 EP 0" "00000001100001111111010000001001" 
usb: "DATA0 00 00 00 00 00 00 00 00 " "000000011100001100000000000000000000000000000000000000000000000000000000000000001111110100101111" 
usb: "SYNC INVALID!" "00000000101001011" 
usb: "IN DEV 47 EP 0" "00000001100101101111010000001001" 
usb: "DATA1 " "00000001110100100000000000000000" 
usb: "ACK " "0000000101001011" 

Photos

Protocol

HID-based.

Resources

  • Protocol / device / software info: 1, 2, 3, 4, 5, 6, 7