Do you have any plan for this weekend? If you haven’t got any, then would you mind to spend the day building this marvelous PIC based A/D converter?
Frankly, many home hobbyists have been familiar with the A/D converter, as it’s one of the common electronic devices that being used in most projects!
Let’s cut the long story short! This PICADC is a very simple 12-bit, 8-channel analog to digital converter. It built based on PIC16F84 microcontroller and a MAX190 ADC. It equipped with four additional digital inputs, which can be connected to the PC through the serial interface RS-232.
The PC is responsible to programming the entire sequence of sampled channels and sampling frequency. The maximal sampling frequency has been limited by the data transmission rate.
The PICADC’s analog input voltage is ranged between -2.5V to 2.5V, while its digital inputs might probably be used, just for recording additional digital signals.
Since the device is quite small, you can mount it on a small-sided printed board easily.
If you’re intend to eliminate the external ADC and multiplexer, then you should substitute it with the integrated 12-bit ADC (PIC16C774).