eChook GPT Documentation
  • Welcome to the eChook nano documentation
  • System Overview
  • The eChook Nano Kit
    • Versions
  • Build Instructions (Kit V1.x)
    • Build Steps Photos
    • First Power On
  • Build Instructions (Kit V2+)
  • Programming the Arduino
    • Install Arduino IDE
    • Arduino Drivers
    • Download the eChook Arduino Code
    • Programming the Arduino
  • Setting up the Bluetooth
    • Pairing with a phone
  • Connecting the eChook to the Car
    • Power and Voltage
    • Current Sensor
    • Throttle Input
    • External Buttons and Brake
    • Temperature Sensors
    • Wheel and Motor RPM
    • PWM Output
  • Calibrating the eChook
    • Wheel Speed and Motor RPM
    • Temperature
    • Voltage
    • Current
  • Using the App
    • Pair eChook to Phone
    • Setting up the App
    • Logging Data
    • Lap Counting
  • Telemetry (Live Data)
    • eChook Live Data
    • Node-Red Integration
    • DIY Web Dashboard
  • Using the Data
  • Circuit Schematics
    • 12 and 24v Inputs
    • Temperature Inputs
    • Bluetooth Module
    • Throttle Input
    • Current Input
    • Button Inputs
    • RPM Inputs
    • PWM Output
    • Power Regulator
    • Expansion Port
  • All about the Arduino nano
    • The eChook nano Code
  • Bluetooth Communication
    • Bluetooth Packet Encoding
    • Bluetooth Packet Decoding
  • Experimental Section
    • GUI Calibration
  • eChook Accessories
  • DIY eChook
  • Spare Parts
  • Troubleshooting
  • Contributing
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  1. Circuit Schematics

Temperature Inputs

Previous12 and 24v InputsNextBluetooth Module

Last updated 6 years ago

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The thermistors form part of a potential divider. The resistance of the thermistor changes with its temperature. As the resistance changes the output voltage of the potential divider changes.

In the diagram above, the ‘Therm’ component to the left represents the three pin connector on the eChook board. Thermistor one is connected between pins 1 and 3, and thermistor two is connected between pins 2 and 3, completing potential dividers with R5 and R7 respectively.

R6 and R8 are in place to protect the Arduino. The Arduino can be easily damaged by too much voltage and without these resistors the pins would be directly connected to an external connector, making them vulnerable. The 1k resistor provides a little protection, although 24v applied to the connector will still damage the Arduino. They also do not affect the reading from the temperature sensor, as the current flowing into the Arduinos Analog to Digital Converter (ADC) is so negligeable that it can be assumed to be 0mA. The voltage drop across the resistor can be calculated by Ohm’s law, V=I*R. In this case, V = 0 * 1000, therefore V = 0.