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USB Analogue Converter

With two analogue inputs and four digital outputs

USB Analogue Converter
This circuit is based on the PIC16C765, a recent addition to the large Microchip PIC family. It can be used to measure two analogue voltages (0–5 V) via two analogue inputs and send the results to a PC via a USB connection. There are also four digital outputs whose levels can be set using the PC.Due to its ease of use, applications for the USB interface continue to proliferate. This time we present a USB analogue converter that has two A/D inputs that can be used to sample analogue voltages (ranging from 0 to 5 V), as well as four digital outputs to which data can be written.This circuit is based on the Microchip PIC16C765 microcontroller, whose pinout is shown in Figure 1.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1 = 1k?5
R2 = 10k?
C1,C2 = 22pF
C3,C4 = 100nF
C5 = 220nF
IC1 = PIC16C765, programmed, order code 020374-41
X1 = 6MHz quartz crystal
K1 = 4-way PCB terminal block
K2,K3 = 2-way PCB terminal block
K4 = USB socket, PCB mount, type B
PCB, order code 020374-1
Disk, contains hex-code and Windowssoftware, order code 020374-11 or Free Download
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