Part 1, 2, 3, 4 And here is the driver code. Nothing exceptional just plain good’ol arduino code. Check the writeByte function which contains few tricks and optimizations that are mandatory to achieve a proper timing. Ultimately this code contains a pretty versatile bit-bang UART writer that you may want to reuse in various applications. Enter […]
Allez, zou, pour une fois voici une publication en français ! Cà fait un moment que çà me grattouillait le clavier de composer dans ma langue maternelle, et je vois au moins deux bonnes raisons de faire une entorse à ma politique de publication. Soyons réalistes, l’anglais est une langue universellement comprise par les technophiles, […]
Part 1, 2 As seen in the previous post, the MCU (e.g. arduino) and the module are talking each other through a serial communication (UART) at a quite modest rate of 9600 baud. Data is exchanged as packets of 10 bytes according to the following structure: Byte# Function Value Comments 0 Start Byte 0x7E constant 1 […]
“Dear cousin, I lost my keys in the middle of the meadows, would you please make a metal detector for me ? Urgent !“ This is really how this project started ! More or less, as I have in mind the design of an Earth’s Field Nuclear Magnetic Resonance spectrometer which features magnetic fields sensors on […]
Part 1, 2, 3, 4, 5, 6, 7, 8, 9 A recent project lead me to excavate a quite old DDS design which may be of some interest for you. Instead of using a ladder of resistors, this design features a simple, cheap and yet powerful digital to analog converter. I will later explain why I choose this particular Microchip circuit but for […]
Part 1, 2 In the previous version, the command parser is using one single alpha character as an opcode while the argument is computed on the fly using simple arithmetic. In this version, the opcode is extended to (almost) any number of characters and the argument is stored in a vector which is then converted […]