A point of clarification for Cliffo's post -
There are two types of pressure transducers. One produces Voltage output and the other produces Millivolt output. The one I referenced in my handbrake post is the type which has a voltage output based on the supply voltage (it scales the input voltage in relation to the pressure it's reading). That type operates on a 5volt circuit. These sensors have three wires from them.
The second type is a Millivolt output type, one which can be used only (for sim racing purposes) on an amplified board. Those pressure transducers have 4 wires from them.
The first type, the "Voltage" ones are around 40 bucks, and the seller, Hubert is very popular among the hydraulic pedal crowd. I have one of them. The second type , the "Milivolt" ones are about 110 bucks and are useful if you want it for a very specific purpose. I have some of these too.
For the purposes of our hydro-handbrake, I'd use the Voltage type as the application doesn't demand the versatility of the Milivolt type.
To connect any of these components, refer to the maker's datasheets. Hubert's normally come with a Red, Green and Black wire, but sometimes the are different. You'd connect one of these to any standard controller board with analog channels, 12bit being preferable and mine being a board one could use. In the case of my 12bit board the "12 Bit Standard" would be one to use, but if you wanted to add a "hydro-handbrake" to your load cell or hydraulic pedals, you can do that by simply using one of the unused channels on that controller board.
For example: Say you have a load cell brake pedal system. The load cell goes into the load cell amp's channel, the throttle into Channel 2 and clutch into Channel 3. If you're on one of boards, you'd probably have Throt on A1, Clutch on A2 and load cell on A6 (the amp channel). You still have A3, A4 and A5 to use (the unused 12bit channels). Slam your sensor onto one of those.
Incidentally, you'd use a standard 3 pin jumper cable to connect to the sensor leads, and simply solder the leads which correspond to the input connections (Mine are +5, GND, An) to those connections on the sensor. Cover each exposed solder joint with shrink tape.
There you have it. Sensor 101
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