DIY a car remotely controlled by WeChat

sigma

DIY a car remotely controlled by WeChat [Copy link]

The idea of this car may be quite strange. It uses WeChat video calls on mobile phones to transmit DTMF audio signals, and the microcontroller does DTMF encoding and decoding to achieve remote control.
System block diagram:

Video: https://v.youku.com/v_show/id_XN ... 5~5!2~5!2~5!2~5~5~A
[media=x,510,498][/media]
During the debugging of the car, it was found that the video call ringtone had a frequency of 770Hzh, so based on this condition, the transistor touch answer button was driven to achieve automatic answering. For
DTMF codec, see my previous post: http://www.openedv.com/forum.php?mod=viewthread&tid=311051&extra=
The operation in the video is not very smooth, and the video call delay is large. Maybe the sound of the remote control is not loud enough, and the mobile phone or WeChat processes the sound other than voice. The program needs to be optimized. The car is driven by the DRV8833 module with four N20 motors and powered by a 2S500mAh lithium battery.
Here are some photos of the production process:
[attach ]483455[/attach]

Author: LcwSwust
Source: Open Source Electronics Network

chineseboyzxy

What a catchy headline! When I saw the title, I thought it was a high-end gadget, WeChat cloud connection, remote control... But when I got in, I saw that it was just a DTMF audio decoding control...

toothache

Let's encourage the OP. I hope the OP will keep up the good work and publish more good works in the future.