Reaction torque sensor¶
350 ohm bridge, 1.5 mV/V, 5 in-oz, at the rear of the lever axis. The board excites it, amplifies it, samples it at 1 kHz and puts a copy on the torque BNC. The left station reads a pull negative where the right reads positive.
| Vendor | Transducer Techniques |
| Part number | RTS-5 |
| Datasheet | mouse-joystick-pcb/docs/datasheets/torque-sensor-specs.png |
| Where | one per station |
| Model nodes | TransducerTechniquesRTS5:* |
Connection¶
| Board | Connector | Cable |
|---|---|---|
| mouse-joystick-pcb | J2001 |
Torque sensor lead |
Circuit¶
Schematic block brake_torque_sensor/torque_bridge_0_3v3_ina821 on the joystick board: its page on the board's site has the schematic, the parts with their sourcing, the ports and where the block sits on the board; the interface map and the schematic PDF at the tagged revision cover the rest.
Firmware¶
Files: mouse-joystick-firm/src/BrakeTorqueHw.hpp, mouse-joystick-firm/src/ADS8689Device.hpp, mouse-joystick-firm/src/BoardCalibration.hpp
Protocol: TQ, STATUS (torque), ev TOUCH, ev PULL / PUSH (protocol)
Proved by: mouse-joystick-firm/examples/BrakeAndTorque, mouse-joystick-firm/docs/brake-torque-bringup.md; measurements in the bring-up log by board serial.
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