Precision Barometer/Altimeter
with temperature readout
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Materials
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.
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The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.
Extra info / Update
Problems with the real-time clock may be solved by downloading updated software from our website. A 56-pF capacitor between pin 12 of IC1 and ground will improve the clock accuracy.
Due to a change in the control software, a few small modifications are required on PCB no. 040313-1. The modified PCB design can be downloaded here (ref. 040313-PCB.pdf). PCBs already supplied through Readers Services, or made at home using the artwork originally supplied, may be modified as detailed below.
The two PCB tracks leading to pin 1 (MCLR) of IC2 are cut as close as possible to the IC pin and then connected to each another only, using a small piece of wire. The track between pin 4 (RA2) of IC2 and junction R7/S1 is cut in the vicinity of pin 4. Next, the interrupted track coming from R7/S1 is connected to pin 1 of IC2.
Component list
R1 = 2k2
R2 = 33
R3 = 330k
R4 = 180k
R5,R6,R7 = 4k7
R8 = 1k
R9 = 1k5
P1 = 10k
Capacitors:
C1, C2 = 22pF
C3,C4 = 100nF
Semiconductors:
D1 = 1N4001
D2,D3 = 1N4148
IC1 = ICL7663
IC2 = PIC16F876, programmed, order code 040313-41)
IC3 = MS5534 (Intersema)
Miscellaneous:
K1 = 9-way sub-D socket (female), PCB mount, angled pins
K2 = HE-10 connector, 2 rows of 8 contacts
S1,S2,S3 = pushbutton DTS63N
X1 = 8MHz quartz crystal, miniature case
X2 = 32.768kHz quartz crystal
LCD, 2x206 characters, e.g., Vikay 2220
28-way IC socket
PCB, ref, 040313-1 from The PCBShop
Project software, code 040313-11
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