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Temperature Sensor Board

with RS-485 interface

Temperature Sensor Board
Temperature sensors are needed in many automation applications, and the RS-485 interface allows reliable communication of data even over long distances. Our compact temperature sensor board is equipped with an ATtiny microcontroller and an RS-485 driver, and it is possible to connect several sensors in parallel to one board. In addition we present some example firmware which communicates temperature readings using the ElektorBus protocol, and software to display the results on a PC provides the finishing touch.
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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.

Components
Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component List
Resistors (0805)
R1 = 2.2kOhm
R2,R3 = 4.7kOhm
R4 = 120Ohm
R5,R6 = 1kOhm
Capacitors
C1,C2,C4 = 100nF 25V, 10%, X7R, SMD 0805
C3 = 10µF 25V, 10%, X5R, SMD 0805
C5 = 100µF 16V, 20%, tantalum, SMD Case F
Semiconductors
D1 = PMEG2010AEH
D2 = LED, yellow, SMD 0805
D3 = LED, green, SMD 0805
IC1 = ATtiny85-20SU, SMD SO-8S2
IC2 = LT1785, SMD SO-8
IC3 = 8MHz quartz oscillator, 5x7mm, SMD (LF SPXO019079)
IC4 = 78L05
Miscellaneous
K1,K4 =2-pin pinheader, 0.1 inch pitch, right angled
K2 = 6-pin (2x3) pinheader or boxheader, 0.1 inch pitch
K3 = 3-way PCB screw terminal block, 0.2 inch pitch
PCB ref. 130468-1 v2.0

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