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Joined: Mon Jan 15, 2018 9:17 pm

RC Car

Mon Jan 15, 2018 9:23 pm

Hi, i am very new to projects with a raspberry Pi and have decided that i would like to turn one into a remote control car, i have been looking and possible waves i could use for the wireless transmission and i only seem to be able to find WiFi, bluetooth, or infared, and none of these really have the range i was looking for, i would like it to have a range of around 50 metres minimum, im not really sure if this is even close to possible but there is no harm in asking i guess. I am also uneducated in regards to how i should power this thing. i have established that the two motors will demand around 5ish volts, how do i go about solving this issue because i believe that the raspberry pi (very old i know, thats why im turning it into a car :lol: ) can only send 3.3 volts how do i go about changing this, it will obviously need to be powered without being plugged into a wall and am unsure how to setup a battery pack and raspberry pi without blowing it up. Thanks in advance

P.S sorry for my noobiness

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Re: RC Car remote control

Tue Jan 16, 2018 11:12 am

To drive the motors (assuming they are DC motors) you need an H bridge. Plenty of different types around for various voltages and currents. There are also some HATs around that make it really easy to interface to a pi - but check the motor's requirements against the bridge spec.

for example https://www.adafruit.com/product/2348 or https://shop.pimoroni.com/products/explorer-phat.

As for the distance, if wifi isn't congested where you are, then wifi should be OK for 50m line of sight - especially if you don't want to stream video.

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Location: Dorset

Re: RC Car

Thu Feb 01, 2018 4:18 pm

OK, I have done this. I picked up an old RC car at the tip and replaced the RC receiver with a Raspberry Pi. Here it is in action: https://www.youtube.com/watch?v=l8Xdn60 ... e=youtu.be

I won't repeat here all the things that I went through to get it going, But basically it uses a program called WebIOPi which unfortunately is no longer supported. It has been replaced by Cayenne. I'm not sure if you can get that to work. WebIOPi won't work with Stretch.

Because I always use a fixed IP address and WiFi ESSID on my R-Pi work, I got an old Access point and use it out where I want to play with the car.

Here is my writeup about it. You might want to find blogs 2-,3- and 4- on this as I tried different IOT programs.
http://madsmaddad.blogspot.co.uk/2016/0 ... c-car.html

Happy to respond to any questions. I would be interested to hear if anyone else has done similar.
Oh, and if anyone knows of a cheap Li-Po charger!

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Re: RC Car

Thu Feb 01, 2018 8:31 pm

If you want distance google "long range 433MHz transmitter module"

There is plenty around that will work over Kms

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Joined: Wed Feb 21, 2018 7:06 am

Re: RC Car

Wed Feb 21, 2018 7:18 am

Bluetooth has the range upto 100 meter, you can use some high range bluetooth dongle with raspberry pi as discussed here viewtopic.php?t=97206.
Even RF has much higher range and as far as I know these are the only wireless technologies (Bluetooth, wifi, RF), which are easiar to interface with Raspberry pi. I have built this Raspberry Pi RC car and able to control with 10-15 meter with normal bluetooth phone.

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