16 bits interface for pedals

Arduino boards are equipped with a 10-bit Analog to Digital converter. This means that they transform the signal coming from the pedal sensors into a number between 0 and 1023 (2^10), this is called the resolution.

To improve it, we can use an external 16-bit Analog to Digital converter like this one. It will convert the signal from the sensors into a number between 0 and 65535 (2^16). To give you a guide, Heusinkveld pedals use a 12 bit resolution (0-4095). The board then communicates with the Arduino using the I2C protocol.

You can connect 4 sensors on this card (3 pedals and a handbrake for example).

The other advantage of using this type of board is the fact that you can connect multiple I2C boards to the Arduino, using only two wires.

For example on the SRT box, we can connect to the I2C port the pedals and two button boxes without any problem.

 

Shopping list

The code is configured to work with the ADS1015 (12 bits) or the ADS1115 chip (16 bits). The ADS1015 is a little bit faster than the ADS1115.

Wiring

The card can be connected to the SRT gearbox PCB on the Button Box port:

ADC1115 16 bits PCB Arduino SRT Gearbox
VDD 5V 5V
GND GND GND
SCL D3 SCL
SDA D2 SDA
ADDR GND GND
A0 – Throttle (potentiometer)
A1 – Brake(potentiometer or loadcell)
A2 – Clutch (potentiometer or loadcell)
A3 – Handbrake

The ADDR pin of the ADS115 can be connected directly to the GND pin of the PCB.

Code (from 2.6)

In the code, set the first boolean to “true” :

 

SRTPedals_ SRTPedals(1, //number of pedals
0, 0, 0, 0,//min
1023, 1023, 1023, 1023,//max
true,//isADS
false,//Led mod
0,1,2,3, //Led pins
&Joystick);

For more help, check this project.

 

I've been passionate about cars since I was a kid! I learned the multiple variations of the Skyline R34 through the Gran Tursimo series, until I discovered GTR2 at the wheel of a keyboard. A few years later, I plunged back into Sim Racing with a G27 which made me enter the DIY world. Always looking for an immersion out of reach in reality, I develop projects that I take care to make accessible to any 3D printer owner!
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