RDing TEMPer

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: Tenx TMU3101MS (datasheet)
  • The markings were removed, but we're relatively sure it's this chip, due to lsusb and pin/feature matching (see below).
• Temperature sensor: Fairchild FM75 (datasheet), I2C slave address 0x4f
• I2C EEPROM: Unknown, yet (markings were removed), I2C slave address 0x50
• Oscillator: 6MHz

Chip pinouts:

Main chip pinout	I2C EEPROM pinout
SCL 1-   O -20 3.3V SDA 2- -19 5V 3- -18 5V 4- -17 3.3V 5V 5- -16 5V 5V 6- -15 LED(5V) GND 7- -14 USB D+ 5V 8- -13 USB D- 3.3V 9- -12 5V Oscillator 10- -11 Oscillator	GND 1-   O -8 3.3V GND 2- -7 GND GND 3- -6 SCL GND 4- -5 SDA

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 -P 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 -P 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

• 

  Device, front

• 

  Device, back

• 

  Device, USB

• 

  Device, opened

• 

  PCB, front

• 

  PCB, back

• 

  Sensor, EEPROM

• 

  Random pads on the side

• 

  Main chip, microscope

• 

  Sensor, microscope

Protocol

HID-based.

Resources

• Relavak Labs: TEMPer Temperature Sensor Linux Driver (libusb software)
• LinuxJournal: Hack and / - Temper Temper (article about Device::USB::PCSensor::HidTEMPer perl module)
• Polarnight blog: TEMPer USB Temperature Sensor – Inside! (a teardown of an older TEMPer version)
• bil: Software to support the TEMPer USB thermistor (blog post)
• Jonathan Gazeley: Nagios plugin for TEMPer USB thermometer (also: TEMPer2.c, code for the USB-to-serial version)
• Tollef Fog Heen's blog: Kernel patches and the TEMPer USB thermometer (also: TEMPer.c)
• No Feature Left behind: Taking advantage of your TEMPer 1.0 USB device (C#, .NET)
• Device::USB::PCSensor::HidTEMPer (Perl)
• Eclectic Security: Dirt cheap USB Temperature Sensor with python SMS alerting system (also: Pytemp2sms)
• CircuitDB: Cheap temperature logging
• RJL: Using Cacti to measure temperatures
• SourceForge: UTAC (C#, .NET)
• Github: TEMPered, temperhum, HID-TEMPerHUM, rbtemper, TEMPer1X, temper1, temper, temper, temper-hum-hid