License

Public Domain

CO2 Detector

2 years ago 2411
  • 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 Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted SeeedStudio
1 ICSP J2 1X05_LOCK 1
2 BUZZER SG3 BUZZER-12MM-NS 1
3 RLA-LO-ALM K1 REY5-19.0X15.0X15.0MM 1 HLS8L-DC5V-S-C SeeedStudio 315030000
4 MH-Z19 U1 MH-Z19 1
5 RLA-HI-ALM K2 REY5-19.0X15.0X15.0MM 1 HLS8L-DC5V-S-C SeeedStudio 315030000
6 HLK-PM01 - AC-DC-converter 5V 600mA U2 POWERSUPPLY MODULE HLK-PM01 1
7 fuse U4 FUSE-5X20-PCB 1
8 ALM HI RLA-HI SCREW TERMINAL 5MM 2P 1
9 ALM LO RLA-LO SCREW TERMINAL 5MM 2P 1
10 11.0592Mhz Y1 HC49UP 1 HC-49US 16.000MHz SeeedStudio 306010014
11 mh-z16 U5 JST-PH7 1
12 HT1117-33_SOT223 U8 SOT-223 1
13 SMD1210R075SF F1 F1210 1 SMD1210R075SF SeeedStudio 307010010
14 240VAC PWR SCREW TERMINAL 5MM 2P 1
15 100nF C8,C1,C4,C5 C0805 4 CC0805KRX7R9BB104 SeeedStudio 302010165
16 IRLML2502TRPBF Q1,Q2,Q3 SEEED-SOT-23 3 SeeedStudio 305030022
17 HI ALM D1 SEEED-LED-0805 1 17-215SURC/S530-A2/TR8 SeeedStudio 304090046
18 LO ALM D2 SEEED-LED-0805 1 17-215SURC/S530-A2/TR8 SeeedStudio 304090046
19 10K R3 R0805 1 RC0805FR-0710KL SeeedStudio 301010361
20 1K R2,R4,R5,R6,R7 R0805 5 RC0805JR-071KL SeeedStudio 301010311
21 100R R1 R0805 1 RC0805JR-07100RL SeeedStudio 301010319
22 22pF C6,C9 C0805 2 CC0805JRNPO9BN220 SeeedStudio 302010151
23 DHT22 U10 SNR4-2.54-15.5X12.0X5.5MM 1 DHT11 SeeedStudio 314010000
24 PIC18F23K22 U6 SOIC-28 1
25 PWR D4 SEEED-LED-0805 1 17-215SURC/S530-A2/TR8 SeeedStudio 304090046
26 1N4007 D3,D5 SEEED-DO-214AC 2 1N4007 SeeedStudio 304010013
27 ERM2004 (buydisplay.com) X1 HDR1X16 1 ERM2004 EastRising (buydisplay.com)
28 S20K250 VAR1 CHOKE_HORIZONTAL_RM10MM_REVB 1
29 5.1K R8 R0805 1 RC0805JR-071KL SeeedStudio 301010311
30 panel U3 HDR1X4 1

Attachments

Filename Download
CO2Detector.X.zip

Members

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