I have a special needs child with multiple physical challenges that I purchased a big 24vDC ride on car. This is a metal frame study unit big enough for a small adult. I purchased an TF8B and an R8EF receiver. I paired them. Unit lights red- assuming PWM from what I read. I “thought” I could use the signal from that to the IN of my 5v relay to close the relay on the 24vDC car gas pedal switch. This is an on/off not a variable. I used a meter to watch the closure, but it does not close. The TF8B is working bc i connected my phone and verified- for simplicity tried channel 5 the switch. But also tried other channels. Originally when I connected the relay to the channel I heard the relay chatter light flicker and when I made changes the TF8B it got louder but did not close. After some searches I realized that it was (even though the PS said 5v, it was giving about 7v.) I have another relay but wanted to know how critical the 5v was. Before I ruin another if I did? Her Birthday is this Friday and with my job responsibilities I have not had enough time to get this done earlier- she is unable to press the gas pedal on her own but loves rides on the riding mower. Please help am I missing something.
Eventually I will work towards reverse/steering but would love to see her ride this for her bday. Thank you all in advance!
Hi @Whitewhale and welcome to our forum.
Can you maybe draw a schematic of your wiring so we can easier understand the problem?
Thank you.
After deeper testing, I decided to try a Arduino nano. I used its 5v pin to power the 5v relay(used 6v power supply for nano, not relying on the USB power)
I wrote a sketch (learning this for the first time) for pin6 to be an LED and pin 5 to be a button. This activated the relay but only from a button not the R8ef. While reading to try to find a similar sketch online I noticed somebody posted some thing with a Baud rate. Basically if someone can help me with a sketch for the above that I could use the R8EF channel to nano pin5 to output 5v on pin 6 that would be helpful and get me closer to understanding the connection between the nano and the receiver.
Thank you for responding. I can draw a sketch, however I think I will be ok once I figure out how to use the TF8B to “talk” to the R8EF, It is paired- it just does not seem to execute the functions on the nano. I will draw up something and post.
Handwritten_2021-04-06_151311.pdf (410.1 KB)
Hopefully this makes sense. My apologies for a childlike rendering. I did try to connect the R8EF signal out to the relay IN, but nothing worked. I read in my research that the T8FB needed to be written into the sketch for the nano. I think once I get the transmitter (TF8B to talk to the nano ie. up=throttle) I should be able to tweak my accessories.
I originally thought that my daughters car was an on/off accelerator but it has three wires going to it and the gas pedal connected to those three wires allows a variable speed to the controller on the car- I may be able to use a small servo to control the potentiometer (guessing) that is on there. Either way, I hope this makes sense