CJMCU-811 - Revision history

Bertrik Sikken at 07:09, 29 July 2019

2019-07-29T07:09:35Z

← Older revision		Revision as of 07:09, 29 July 2019
Line 3:		Line 3:
	\|Picture=cjmcu811.jpg		\|Picture=cjmcu811.jpg
	\|Omschrijving=Playing around with a breakout board for the CSS-811 IC		\|Omschrijving=Playing around with a breakout board for the CSS-811 IC
	\|Status=~~In progress~~		\|Status=Completed
	\|Contact=bertrik		\|Contact=bertrik
	}}		}}

2019-07-13T07:40:11Z

pinout

← Older revision		Revision as of 07:40, 13 July 2019
Line 92:		Line 92:
	* pin D6 goes to CCS811 SDA		* pin D6 goes to CCS811 SDA
	* pin D7 goes to CCS811 SCL		* pin D7 goes to CCS811 SCL
	* pin D8 goes to CCS811 GND, we use a data pin as ground because the D1 mini has only one ground pin		* <s>pin D8</s> GND goes to CCS811 GND <s>we use a data pin as ground because the D1 mini has only one ground pin</s>
	* pin 3V3 goes to CCS811 VCC		* pin 3V3 goes to CCS811 VCC

2019-07-13T07:39:13Z

Application to air quality monitoring at RevSpace

← Older revision		Revision as of 07:39, 13 July 2019
Line 71:		Line 71:

	== Application to air quality monitoring at RevSpace ==		== Application to air quality monitoring at RevSpace ==
	A sensor ~~like this could be used to monitor indoor air quality at Revspace~~.		The sensor is currently present in the RevSpace main room.

	~~The plan is to build~~ a ~~TVOC sensor with~~ the following ~~features~~:		It has temperature/humidity compensation using a BME280.
	* ~~compensation of influence of temperature and humidity~~
	* ~~keeping track of~~ the ~~baseline of~~ the ~~sensor~~		Values are available on the RevSpace MQTT on the following topics:
	* ~~display of current TVOC concentration on an RGB LED stick~~		* revspace/sensors/tvoc/F091A0/status can be "online" or "offline"
	* ~~reporting of current TVOC concentration over MQTT~~		* revspace/sensors/tvoc/F091A0/ccs811/tvoc is the TVOC concentration in ppm
			* revspace/sensors/tvoc/F091A0/ccs811/eco2 is the "equivalent CO2" concentration in ppm
			* revspace/sensors/tvoc/F091A0/bme280/temperature is the temperature inside the case in degrees Celcius
			* revspace/sensors/tvoc/F091A0/bme280/humidity is the relative humidity inside the case in percent

			There is no LED display.

	=== pinout ===		=== pinout ===

2019-02-22T16:40:09Z

WS2812 LED bar display

← Older revision		Revision as of 16:40, 22 February 2019
Line 102:		Line 102:

	Also, I don't know what a specific TVOC concentration means, e.g. what level is considered as clean air?		Also, I don't know what a specific TVOC concentration means, e.g. what level is considered as clean air?

			The air at RevSpace appears to default to a quite high value of approximately 500-1000, probably because of Alklanet vapours.

	=== baseline saving ===		=== baseline saving ===

2019-02-18T16:57:38Z

← Older revision		Revision as of 16:57, 18 February 2019
Line 27:		Line 27:

	Very roughly from experimentation (and memory):		Very roughly from experimentation (and memory):
	* Alklanet ~~cleaning solution~~, ~~quite~~ sensitive to this stuff, we use ~~this stuff~~ everywhere in the space		* Alklanet (contains 2-butoxyethanol), very sensitive to this stuff, we use it everywhere in the space to clean working surfaces
	* permanent marker: very sensitive to it		* permanent marker: very sensitive to it
	* butoxyethanol: very sensitive
	* toluene: very sensitive		* toluene: very sensitive
	* acetone: very sensitive		* acetone: very sensitive

2019-02-17T21:28:36Z

@@ Line 23: / Line 23: @@
 * [https://keetweej.vanheusden.com/grafana/d/uL--TeUiz/ccs811 private Grafana page]
 * [https://keetweej.vanheusden.com/grafana/dashboard/snapshot/fv8xpNqHkFyXI5CfBS7oNquoNKdfXxu3 public Grafana snapshot]
 == Hardware ==

2019-01-31T17:23:14Z

WS2812 LED bar display

← Older revision		Revision as of 17:23, 31 January 2019
Line 84:		Line 84:

	=== WS2812 LED bar display ===		=== WS2812 LED bar display ===
	~~The idea is that a kind of~~ RGB LED bargraph shows the current TVOC concentration, using a WS2812 RGB LED stick.		A RGB LED bargraph shows the current TVOC concentration, using a WS2812 RGB LED stick.
	On a logarithmic scale of 8 pixels, LEDs light for each of the following levels: 62, 125, 250, 500, 1000, 2000, 4000, 8000 ppb		On a logarithmic scale of 8 pixels, LEDs light for each of the following levels: 62, 125, 250, 500, 1000, 2000, 4000, 8000 ppb

2019-01-31T07:47:46Z

Neopixel display

← Older revision		Revision as of 07:47, 31 January 2019
Line 83:		Line 83:
	The CCS811 doesn't play nice with other I2C devices on the same bus (perhaps this is caused by the clock stretching requirement).		The CCS811 doesn't play nice with other I2C devices on the same bus (perhaps this is caused by the clock stretching requirement).

	=== ~~Neopixel~~ display ===		=== WS2812 LED bar display ===
	The idea is that a kind of RGB LED bargraph shows the current TVOC concentration, using a ~~Neopixel~~ RGB LED stick.		The idea is that a kind of RGB LED bargraph shows the current TVOC concentration, using a WS2812 RGB LED stick.
	On a logarithmic scale of 8 pixels, LEDs light for each of the following levels: 25, 50, ~~100~~, ~~200~~, ~~400~~, ~~800~~, ~~1600~~, ~~3200~~ ppb		On a logarithmic scale of 8 pixels, LEDs light for each of the following levels: 62, 125, 250, 500, 1000, 2000, 4000, 8000 ppb

	~~Unfortunately, I can't get the neopixel strip to work yet.~~
	Also, I don't know what a specific TVOC concentration means, e.g. what level is considered as clean air?		Also, I don't know what a specific TVOC concentration means, e.g. what level is considered as clean air?

2019-01-31T07:44:46Z

temperature and humidity correction

← Older revision		Revision as of 07:44, 31 January 2019
Line 77:		Line 77:

	=== temperature and humidity correction ===		=== temperature and humidity correction ===
	A BME280 ~~could be~~ used to read ambient temperature and humidity.		A BME280 is used to read ambient temperature and humidity.
	The microcontroller inside the CCS811 can use this information to improve the reading.		The microcontroller inside the CCS811 can use this information to improve the reading.
	~~Not sure~~ on ~~how~~ to ~~best connect it, perhaps~~ on the same ~~i2c~~ bus?
			It can be connected on the same I2C bus, but the software has to toggle the CCS811 WAK pin.
			The CCS811 doesn't play nice with other I2C devices on the same bus (perhaps this is caused by the clock stretching requirement).

	=== Neopixel display ===		=== Neopixel display ===

2019-01-30T22:29:07Z

pinout

← Older revision		Revision as of 22:29, 30 January 2019
Line 67:		Line 67:
	=== pinout ===		=== pinout ===
	See https://github.com/bertrik/tvocmeter		See https://github.com/bertrik/tvocmeter
	* pin D1 goes to CCS811 ~~SCL~~		* pin D3 goes to WS2812 VDC
	* pin D2 goes to CCS811 SDA		* pin D4 goes to WS2812 DIN
	* pin D3 goes to CCS811 ~~WAK~~		* pin GND goes to WS2812 GND
			* pin D5 goes to CCS811 WAK
			* pin D6 goes to CCS811 SDA
			* pin D7 goes to CCS811 SCL
	* pin D8 goes to CCS811 GND, we use a data pin as ground because the D1 mini has only one ground pin		* pin D8 goes to CCS811 GND, we use a data pin as ground because the D1 mini has only one ground pin
	* pin D4 goes to ~~Neopixel DIN~~		* pin 3V3 goes to CCS811 VCC
	* pin 5V goes to Neopixel VDC
	* pin GND goes to Neopixel GND

	=== temperature and humidity correction ===		=== temperature and humidity correction ===