Firmware upload instructions

README.md

@@ -27,7 +27,7 @@ Please refer to the [How To Build Loopy](./howto.md) page.
 
 ###  Where can I find a PCB?
 
-Please contact me if you need a PCB: I will try to have some available as long as there is demand for it.
+Please contact me if you need a PCB: I will try to have some available as long as there is demand for it. Alternatively, you can check [my eBay profile](https://www.ebay.co.uk/usr/daviderocker82it).
 
 ###  Why no display?
 
@@ -48,3 +48,4 @@ No. However, I could be interested in discussing a partnership. Please get in to
 ###  Can I have the source code of the firmware?
 
 No. At the moment, I have decided to keep the source code private. However, HEX file for the firmware is available in this repo, and you are free to program your own chip with it.
+Check the [instructions on how to setup your microcontroller](./firmware.md).

firmware.md

@@ -0,0 +1,37 @@
+# How to Program Loopy
+
+In order to program Loopy, you need:
+- an atmega328(p) chip
+- an AVR programmer (an inexhpensive USBasp is perfectly fine, like the one [here](https://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=140_161_163&products_id=1233))
+- a 10 to 6 pin adapter if your programmer is not supplied with one, like the one [here](https://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=140_161_163&products_id=2848)
+- [avrdude](https://www.nongnu.org/avrdude/) correctly installed on your computer (installation are dependent on your OS of choice -- if you are on Mac, the easier way is to use [brew](https://formulae.brew.sh/formula/avrdude))
+
+Once your computer is setup, you need to run three commands on your terminal.
+
+The first command is mandatory to initialise the chip, and needs to be performed only on a blank chip. 
+
+Once the initialisation is completed, the chip will work only if correctly connected to an oscillator: I strongly suggest to use the 6 pin header on the PCB to install the firmware.
+
+## Fuses
+
+If your chip has already a working copy of the firmware, you can skip this step. Otherwise, run:
+
+```
+avrdude -c usbasp -p atmega328p -B16 -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xFF:m -U lock:w:0xFF:m
+```
+
+## Firwmare
+
+The second command will upload the firmware on the chip:
+
+```
+avrdude -c usbasp -p atmega328p -U flash:w:<hex file location>
+```
+
+## EEPROM
+
+The third command will setup the EEPROM, where the chip stores presets. Upload of the firmware will reset this location of memory: the following command will restore default values.
+
+```
+avrdude -c usbasp -p atmega328p -U eeprom:w:loopy.eep
+```