CO2 Detector

4 years ago 3932
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

Uses MH-Z19 or MH-Z16 CO2 detector and DHT-22 (or DHT-11) Temperature/Humidity sensor to give air quality readout and actuate relays if CO2 level goes above 1000ppm (Lo Alarm for turning on extraction fan) and High Alarm at 5000ppm to sound an alarm etc. Uses large 20 x 4 HD44780 display

Hardware is 100% Complete. Software is about 90% Complete (Works but untested and buzzer/silence not yet worked out) Will post code back here and on my website when 100% have attached Work In Progress MPLABX XC8 Code (incomplete but which will display CO2 levels)

Has spare UART brought out to header to attach MODBUS/WiFi/Bluetooth if required. PCB footprint suitable for mounting in standard industrial 158x90x65mm Plastic Enclosure

Documents

Circuit

New PCB

BOM

ID Value Qty. Package Components
1 ICSP 1 1X05_LOCK J2
2 BUZZER 1 BUZZER-12MM-NS SG3
3 RLA-LO-ALM 1 REY5-19.0X15.0X15.0MM K1
4 MH-Z19 1 MH-Z19 U1
5 RLA-HI-ALM 1 REY5-19.0X15.0X15.0MM K2
6 HLK-PM01 - AC-DC-converter 5V 600mA 1 POWERSUPPLY MODULE HLK-PM01 U2
7 fuse 1 FUSE-5X20-PCB U4
8 ALM HI 1 SCREW TERMINAL 5MM 2P RLA-HI
9 ALM LO 1 SCREW TERMINAL 5MM 2P RLA-LO
10 11.0592Mhz 1 HC49UP Y1
11 mh-z16 1 JST-PH7 U5
12 HT1117-33_SOT223 1 SOT-223 U8
13 SMD1210R075SF 1 F1210 F1
14 240VAC 1 SCREW TERMINAL 5MM 2P PWR
15 100nF 4 C0805 C8,C1,C4,C5
16 IRLML2502TRPBF 3 SEEED-SOT-23 Q1,Q2,Q3
17 HI ALM 1 SEEED-LED-0805 D1
18 LO ALM 1 SEEED-LED-0805 D2
19 10K 1 R0805 R3
20 1K 5 R0805 R2,R4,R5,R6,R7
21 100R 1 R0805 R1
22 22pF 2 C0805 C6,C9
23 DHT22 1 SNR4-2.54-15.5X12.0X5.5MM U10
24 PIC18F23K22 1 SOIC-28 U6
25 PWR 1 SEEED-LED-0805 D4
26 1N4007 2 SEEED-DO-214AC D3,D5
27 ERM2004 (buydisplay.com) 1 HDR1X16 X1
28 S20K250 1 CHOKE_HORIZONTAL_RM10MM_REVB VAR1
29 5.1K 1 R0805 R8
30 panel 1 HDR1X4 U3

Attachments

Filename Download
CO2Detector.X.zip

Members

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