PIC
About the article

LM35 to ADC

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LM35 to ADC
The circuit described here is the digital and display section of a thermometer; the analogue circuitry and signal conditioning required to use an LM35 temperature sensor are described elsewhere in this issue (‘LM35 to ADC’). The analogue-to-digital converter used here is hidden inside a PIC16F873 microcontroller behind the RA5 port pin. It has a resolution of 10 bits (1024 steps), allowing a temperature range of 128 ?C to be divided into steps of exactly 128 ?C / 1024 = 0.125 ?C.
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Products
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.

Resistors
R1 = 10k
R2-R13 = 220
Capacitors
C1 = 100nF
C2 = 10µF 16V radial
Semiconductors
D1-D5,D7-D11 = LED, 5mm
D6 = TwinLED (DuoLED) green/yellow
IC1 = PIC16F873-20/SP, programmed, order code 030190-41
Miscellaneous
X1 = 8MHz ceramic resonator (3 pins)
S1,S2 = BCD complement switch (APEM PT65-702)
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