> For the complete documentation index, see [llms.txt](https://docs.echook.uk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.echook.uk/circuit-schematics/throttle-input.md).

# Throttle Input

![](https://lh5.googleusercontent.com/ZZ80DKpSIDq_BIzbv4uH4nYnioSEmAR0fajAoG0SSrN1zo3pzzHG_jTPJiBhohvIJzJBwHMSHbvjjYH8JP9PpJ3dIKFYpEjQlw3OQqrrHCl8tW_lE26jNz0cC21xKX3Nmvy_BNIr)

The throttle connector provides 5V and ground for the external throttle, plus a signal connection to the Arduino through a 1k protection resistor.

This resistor helps limit fault current into the Arduino input pin during wiring mistakes, but it is not a full overvoltage clamp.

For wiring methods and voltage-limiting guidance, see [Throttle Input](/connecting-the-echook-to-the-car/throttle-input.md).