Some time ago I purchased a dozen or more Arduino Pro Mini 328 3.3V 8Mhz boards, but only recently had a use for them. I was quite disappointed to find that 8 boards could not be programed through the Arduino IDE. Here’s how I rebuilt and reprogrammed the bootloader and fixed the problem using an STK500 and Ubuntu Linux. Software Setup You’ll need a working Arduino build environment and a tool like avrdude that can communicate with your ISP programmer: sudo apt-get install make git sudo apt-get install gcc-avr avr-libc avrdude sudo apt-get install arduino Then, get the latest Arduino source from GitHub: git clone Hardware Setup To program the bootloader, you’ll need: • An Arduino Pro Mini 328. • An In-System-Programmer (ISP). I use an development board, but it is possible to use other ISPs,. How to bootload a atmega328-pu using arduino uno? I made the connection as shown in the above picture taken. Trying to install bootloader on Osoyoo Pro Micro. If using this loader, you must set the board to “Arduino UNO” in the IDE, instead of “Arduino Pro Mini 3.3V”, or customize boards.txt. To quickly tell which loader is installed on a Pro Mini, count the number of green LED flashes after a reset: the standard bootloader flashes once. • A means of connecting the ISP 6-pin header from your programmer to individual pins on the Pro-Mini. Jumpers like, or work well. • The correct parameters for communicating with your ISP. In my case, I use the default baud rate, the stk500v2 protocol, and /dev/ttyS0. Connect the ISP 6-pin header from your programmer to the Pro-Mini like so: In the schematic above, note the numbers inside the ARDUINO_MINI symbol correspond to the Arduino pin-numbering scheme that matches the labels printed on the Pro-Mini board. Test the setup to make sure everything is working by reading the fuses (adjust port and protocol as required for your ISP): $ avrdude -P /dev/ttyS0 -c stk500v2 -p m328p avrdude: AVR device initialized and ready to accept instructions Reading| ##################################################| 100% 0.01s avrdude: Device signature = 0x1e950f avrdude: safemode: Fuses OK avrdude done. Selecting a Bootloader There are 8 different types of bootloaders in use across various Arduino boards. A definition for each Arduino board type, including baud rates, programming protocols, and bootloaders, is found in./hardware/arduino/boards.txt. When you select a board from the Tools menu of the Arduino IDE, the properties for that board are loaded from boards.txt. If you aren’t sure which bootloader your Arduino uses, search through boards.txt and locate the corresponding “bootloader.file” in the sources. Said: For OTA you need to flash the boot loaders that allow this. The standard boot loaders do not have this ability to OTA update. Ok, but after the new release of mysensors ver 2.0 lib and my wish to update my gw and sensor nodes I would like to add OTA update ability as well for upcoming updates. • So does a 1 MHz Bootloader with OTA exist that is compatible to the one from above? • Could OTA easily be added to the above 1MHz Bootloader? • Should i just use the 'ATmega328 internal 8Mhz with MYSBootloader' instead of the above mentioned bootloaders?
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March 2019
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