I'm totally new to Raspberry Pi and I want to use it for an important school project.
My aim is to build a laser-seismograph using a laser pointer and 4 photodiodes which basically measure the laser's light intensity. The photodiodes (TSL257-LF) have a built-in amplifier, with the result that they convert light intensity to voltage. The output range of the photodiodes is 0-5 DC Volt. Now I need to measure simultaneously all four voltages of the photodiodes with a rather good accuracy (maybe ±10 mV, if possible ±1 mV) in order to know the current position of the laser dot.
I have read on several forums that I'd need a digital to analog converter such as the MCP3008, but I have no idea whether it is true, nor how I should connect it to the different elements. Also it has been said that the range would be 0-3.3 V without any supplementary circuitry.
It would be a great help if you explained step by step what I need to do in your opinion to measure the voltage of each photodiode.