Remote Development of Microcontrollers Using Raspberry Pi

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The Raspberry Pi and the 51 microcontroller seem like unrelated platforms, but after some effort, it turns out that we can use the Raspberry Pi for remote development of the microcontroller. Where there’s a will, there’s a way. Thanks to Da Fan Jin Han for the submission. The detailed implementation process can be found below the video, or you can get the corresponding code by replying: Raspberry Pi Development Microcontroller in the “Darwin says” WeChat.

Project Demonstration↓↓↓

Project Background

In 2020, the pandemic hit suddenly, and our lives became less joyful! But as someone about to become unemployed after graduation, to enhance my coding skills, I had an idea: Find a way to code and experiment remotely!!

Alright, the serious nonsense ends here, mainly because my poor writing skills just can’t go on! Spare me!!! The real reason is that I, being poor, really can’t afford to buy a development board to learn.

Project Components List

Intranet penetration tool

This is certainly recommended to use Peanut Shell.

We need a device for remote connection

I had a Raspberry Pi 3B that had been collecting dust for a long time, so I took that out to use.

A development board to execute programs

This is a 51 development board I used before.

A camera for displaying images

In the spirit of frugality, I dug out an old USB camera from 10 years ago.

Some relays

Can’t guess what this is for? I’ll keep it a secret for now.

Project Implementation Process

Step 1: The Raspberry Pi can use VNC for remote desktop, but as someone who loves tinkering, I can’t just settle for having to install a client! Absolutely not!!! So I chose noVNC, which has HTML5 parsing for the VNC protocol. That way, the remote part is okay.

Step 2: I chose SDCC for compiling the 51 microcontroller. After compiling, a hex file will appear, but for many friends, this is not enough; the hex format file is still large, we need to use bin!!! Everyone can use Hex2bin for conversion. Okay, now all that’s left is to download via serial. For remote downloading, I chose the open-source STCGAL for burning.

Step 3: Let’s take a look at the remote camera; there are many solutions for remote cameras, here I chose motion.

Alright, after analyzing, let’s roll up our sleeves and get to work!

Detailed Project Implementation Process

1) Burn the system onto the Raspberry Pi and let’s follow the old rule to change the software source of the Raspberry Pi to a domestic source.

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak sudo cp /etc/apt/sources.list.d/raspi.list/etc/apt/sources.list.d/raspi.list.bak

Modify the software update source with the following command:

sudo vi /etc/apt/sources.list

Press i to enter edit mode, change it to Tsinghua’s software source address, press ESC to exit, then 😡 to save and exit.

deb http://mirror.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main contrib non-free rpideb-src http://mirror.tuna.tsinghua.edu.cn/raspbian/raspbian/ bustermain contrib non-free rp

Modify the system update source with the following command:

sudo vi /etc/apt/sources.list.d/raspi.list

Comment out the original image with a #, then insert Tsinghua’s system source address, save and exit:

deb http://mirror.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui

Synchronize and update the source and software packages with the following commands:

sudo apt-get updatesudo apt-get upgrade

2) After changing the source, let’s enable the built-in VNC of the Raspberry Pi

Enter the following command in the terminal to access the configuration interface:

sudo raspi-config

Follow the steps: Interfacing Options -> VNC -> Yes. Then the system will prompt you to install the VNC service, enter y and press enter, and wait for the system to automatically install and complete. If the ancestors still love us, it should have been enabled successfully.

To be safe, let’s check if vncserver is installed locally (actually just checking if the ancestors are still showing their spirit).

whereis vncserver

If not, please install it manually:

yum install -y tigervnc-server

If successfully installed, look here, use the following command to run vnc

vncserver

At this point, you will be asked to enter a password. Here’s a note: The VNC server will run in the background. The port that it runs on is the display number + 5900 (i.e. 5901 in the case above).

This means that when you execute vncserver :1 set to 1, the port number for running VNC below should be 5900+1, which is 5901; the default port for VNC is 5900.

3) Install noVNC

# Install gitsudo apt-get install git# Get the source code for noVNCgit clone https://github.com/kanaka/noVNCEnter the noVNC directorycd noVNCRun noVNC (the first run may take some time to download a port forwarding program) ./utils/launch.sh --vnc localhost:5901

4) Install the 51 development environment

The development environment here depends on Python3, so make sure Python3 and pip3 are installed. If not, please download pip3.

5) Install the CH340 driver on the Raspberry Pi

Note that the driver needs to be downloaded from the official website (Linux version).

6) Install the USB camera monitoring interface

7) “Simple” modification of the noVNC interface

The detailed process for the above four steps can be found in the shared attachment. Reply “Raspberry Pi Development Microcontroller” in “Darwin says” WeChat.

8) Write a relay control script to power on the microcontroller

We use one of the Raspberry Pi’s pins to control the relay, and the relay controls the power on and off for the microcontroller. The script code is as follows; you can choose different pins for control, and I won’t elaborate further.

# -*- coding: utf-8 -*-import RPi.GPIO as GPIOimport time# BOARD numbering method, based on socket pin numberingGPIO.setmode(GPIO.BOARD)# Output modeGPIO.setup(0, GPIO.OUT)GPIO.output(0, GPIO.HIGH)time.sleep(1)GPIO.output(0, GPIO.LOW)time.sleep(1)

After running this code, we will see a warning as follows:

 RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings.

We can ignore this warning. Once all the above steps are completed, we can achieve remote development of the 51 microcontroller with the Raspberry Pi.

This sharing ends here! Finally, thank you all for your patient reading, if possible, please grant me a job offer or a pretty girl. Thank you!

END

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