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USB Thermometer

A simple method to read data from the USB port

USB Thermometer
For many years the serial RS232 computer port could be relied upon as a sort of MacGyver universal port. Nowadays PCs are unlikely to be supplied with this 9-pin sub-D connector. When you need to hook up some electronics to a computer, the USB port looks like the only option. The computer however needs a corresponding software driver. Here we describe an elegant patch around this problem.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.

R1,R3 = 68Ohm
R2 = 1.5kOhm
R4 = 470Ohm
R5 = 10kOhm
C1 = 100nF ceramic, 5mm pitch
C2 = 25µF 16V, electrolytic, 2.5mm pitch
IC1 = ATtiny85-20UP, 8-pin DIL, programmed, Elektor # 120620-41 [6]
IC2 = DS18B20, 3-pin TO92 case
D1,D2 = ZF3.6, zener diode, 0.5W
D3 = LED, green, 5mm
K1 = USB socket, Type A, PCB mount
K2 = 6-pin (2x3) pinheader, 0.1’’ pitch
PCB # 120620-1 [6]
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