![]() There is a handy sketch in the examples section of the IDE that turns the UNO into a programmer. ![]() It turns out that you can use an Arduino UNO as an ISP so why not use one for programming the Pro-Mini. Still not an ideal solution.Ī purpose built Arduino ISP module isn't that easy to find and it costs about twice the price of a UNO. But hold on the Pro-Mini doesn't have an ISP connector so you have to connect the wires on a breadboard or something. The ISP connects to a USB port on your PC and the ISP connector on the Pro-Mini. The Pro-Mini can be programmed using an In System Programmer or ISP which bypasses the bootloader altogether. While it was in that state I could not program it with the serial port. It went to sleep ok but the bootloader forced it into a perpetual reset loop. As a result of this I got into trouble when I loaded my low power sleep program. The bootloaders are not the same and they behave slightly differently. There is another annoying difference between the Pro-Mini and the UNO. The Pro-Mini can still be programmed through it's serial port using the onboard bootloader but you need a USB to serial adapter before you can connect it to your PC. To keep the size down the USB socket has been omitted from the Pro-Mini board. ![]() Boards can be purchased for less than 2 GBP or 2 USD making them useful for all kinds of things. The best part about the Pro-Mini is the price. It will work with a Vcc as little as 1.8v and with a little surgery it is possible to reduce the current drawn in power down sleep mode to just 5♚ making it possible to run some devices for more than a year on a single 3v button cell. The Arduino Pro-Mini is a tiny microcontroller board with capabilities similar to that of the UNO.
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