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NAM 0.3 Hardware SDS011 Reseter

2 months ago 261
  • Description
  • Documents
  • BOM
  • Attachments
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Description

During our extensive use of SDS011 in NAM sensors we encountered some problems. Sometimes SDS011 hangs and become unresponsive. UART communication doesn't work at all. Our research shows that the reason is probably because of bugs in it's firmware. Only working method of restoring communication is to power off the SDS011 for couple seconds. Because in remote location it's usually impossible to cut the power off, we design this module to automate this task.

This module is plugged directly to EXT port of Nettigo Air Monitor 0.3. On board you will find PCF8574TS communicating via I2C on 0x26 address. Channel P0 controls power delivered to SDS011 connector. Ports P1-P7 may be used for other purposes in future as GPIO over I2C.

If you need one, you can build it by yourself or buy one at Nettigo.eu.

Compatibility:

  • The module is compatible with all NAM versions equipped with an EXT connector (from version 0.3.2 and above).
  • The module is compatible with HECA and HECA 2.
  • The module is compatible with the LED bar.
  • In the standard configuration, the module CANNOT be used together with the 4x20 LCD screen. It is possible to use IDC16 tape to connect the module and hot glue for mechanical assembly, but this is untested and requires a bit of DIY :)
  • The module has an EXT pass through connector, so theoretically you can still use CO2 sensors and GPS receivers, of course, if you find a place for them in the enclosure.

Documents

NAM SDS011 Hard Reset

NAM SDS011 Hard Reset

BOM

ID Name Designator Footprint Quantity BOM_Supplier
1 100nF C1 0603 1 LCSC
2 2.54-5P CN1 CONN-SMD_2.54-5P-WT 1 LCSC
3 DS1023-2*8S21 H1 DS1023-2*8S21-EDGE 1 LCSC
4 HDR-IDC-2.54-2X8P H2 HDR-IDC-2.54-2X8P 1 LCSC
5 Green LED1 LED0603-R-RD 1 LCSC
6 BC817 Q1 SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR 1 LCSC
7 FDV304P Q2 SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR 1 LCSC
8 1K R1 R0603 1 LCSC
9 10KΩ R2,R3,R13,R14 0603 4 LCSC
10 PCF8574TS/3,118 U1 SSOP-20_L7.5-W5.2-P0.65-LS8.0-BL 1 LCSC

Attachments

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