Making a VVVF inverter with a raspberry pi zero.
This code is baremetal on a raspberry pi zero.
The main repository is for 2 and 3 level vvvf.
YOU ARE RESPONSIBLE FOR ANYTHING THAT HAPPENS IF YOU USE THE INFORMATION FROM THIS PROJECT.
IT MAY DAMAGE ELECTRONICS.
THIS VVVF CODE IS NOT MADE BY AN ENGINEER OR ANY PROFESSIONAL.
The main author of this program is JOTAN-0655 except for the raspberry pi lib.
Please reference this github url if you upload on youtube or other websites.
https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf
https://github.com/licux/BareMetalInvaders (I borrowed some code from here.)
You need to install cross compiler.
sudo apt install gcc-arm-none-eabi
Normally, just run
sh build.sh
When you have built the code, you will find kernel.img inside of build folder.
What you need to do is
From https://github.com/raspberrypi/firmware/tree/master/boot , you have to get
- bootcode.bin
- start.elf
Now, you need to have a SD card which has more than 2GB but less than 32GB.
Also the SD card needs to be formated with FAT32.
Now , it's time to install.
Copy bootcode.bin , start.elf and kernel.img that you have built.
If you want the raspberry pi zero to run faster, make config.txt and just paste next code.
force_turbo=1
This number is the BCM GPIO number.
-
PIN_U_HIGH_2 12
-
PIN_U_HIGH_1 13
-
PIN_U_LOW_1 11
-
PIN_U_LOW_2 21
-
PIN_V_HIGH_2 16
-
PIN_V_HIGH_1 6
-
PIN_V_LOW_1 9
-
PIN_V_LOW_2 26
-
PIN_W_HIGH_2 20
-
PIN_W_HIGH_1 5
-
PIN_W_LOW_1 25
-
PIN_W_LOW_2 19
-
debug_PIN_2 23
-
debug_PIN 24
-
LED_PIN 47
This number is the BCM GPIO number
- mascon_1 4
- mascon_2 17
- mascon_3 27
- mascon_4 22
Inside the program, this will generate a integer by using mascon_1 ~ mason_4.
This is the how the integer will be.
mascon_status_value = input(mascon_1) | input(mascon_2)<<1 | input(mascon_3)<<2 | input(mascon_4)<<3
When mascon_status_value equals to 4 , the motor will remain at the same speed. If it is less than 4 (3,2,1,0), vvvf frequency will decrease. 0 is most strong frequency decrease. If it is more than 4 (5,6,7,8), vvvf frequency will increase. 8 is most strong frequency increase.
- button_R 7
- button_SEL 8
- button_L 18
When button_SEL is pressed, it will stop the vvvf inverter and set all of the vvvf pins to low. When button_R/L is pressed, it will change the vvvf sound.