Interface Circuits | Electronic Project Circuits

Posts Tagged ‘interface circuits’

IO Controller with Command Line Interface

This code runs on a PIC 16F627A or 628A (and A.F.A.I.K 627/628 parts). It uses the serial USART on the PIC to communicate with a PC. Through this a simple CLI (Command Line Interface) is implemented that allows commands to be sent to the PIC to control output lines and read and return the status of inputs on the PIC The serial interface is configured to operate at 9600bps, 8bits, No Parity, 1 stop bit. Port A is configured as the output port, not forgetting that RA4 is an ‘input only’. Port B is used as the input port, again RB1 and RB2 are used by the PIC USART so aren’t available.
Read Source: http://picprojects.org.uk/projects/picprojects.htm#IO

Be the first to comment - What do you think? Posted by admin - June 2, 2009 at 9:08 am

Categories: Digital, Microcontroller Tags: interface circuits, IO Controller circuit

USB to RS232 Converter by IC MAX235

Why build my own USB to RS232 converter when there are adapters already available from many suppler? The Answer is simple: Neither the strand “USB to RS232 converter” actually worked *properly* with all the devices I tried. But, They did not seem to support ALL the RS232 lines. The USB to RS232 converter using the FT8U232AM and a Maxim-IC MAX235

Read more source: http://www.pccompci.com/usb-converter/usb-converter.html
Thank you.

Be the first to comment - What do you think? Posted by admin - May 12, 2008 at 2:18 pm

Categories: Digital Tags: Circuit com, interface circuits, USB RS232 converter

VCO – Analog to Digital by LM331

This Circuit is a simple Analog to Digital Interface with a capability of 10 to 12 bits resolution. 10 bits means 1024 counts or parts of a full scale FS which is close to 3-1/2 1999 counts. In this 1 V can be read as 1.000 V that means even 1mV can be resolved for FS of 1V.
The Caps C6 and others must be plastic multilayer low-leakage types for accuracy of reading. Use all 1% MFR 100ppm or better resistors, Design gain of U1B for the Full Scale you want. The Output Fout is a Frequency which is directly proportional to the measured voltage Vin.
The pulses can be isolated using opto-couplers to avoid ground loops or electric hazard. An additional protection and scaling circuit at the input may be required for some sensors.