Hello everyone! I am working on a remote killswitch for a childrens 24v dirt bike. I'm going to be using HC-12's to remotely send a signal to the dirt bike whereas if a deadmans switch is not enabled, the bike will not work. This is so when teaching my nephew how to ride I can control the power of the bike remotely.
The circuit pictured has an arduino Pro Mini @5v. The vehicle batteries are at 24v, the arduino can only handle a 12v input so I've installed a 7812 to knock the 24v down to 12v. I did not included any caps as if the output is noisy, that will be handled by the 5v regulator on the arduino. I'm going to have the 7812 mounted to the PCB to dissipate heat but the arduino and HC-12 shouldn't be pulling more than 200mA.
I'm going to be using an NPN BJT to control a relay. When the circuit is OFF the battery will be connected to the 24V charger power which is just wired to the side panel of the motorbike for connecting the charger. When ON the power will be directed to the 24V Motor Controller.
I'm just looking for a peer review if my circuit to see if I've missed anything big. I haven't designed a circuit in a while and I chose those parts simply because it's what I have on hand.
Thank you!
