diff options
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | .reuse/dep5 | 9 | ||||
| -rw-r--r-- | LICENSES/BSD-2-Clause.txt | 9 | ||||
| -rw-r--r-- | LICENSES/CC0-1.0.txt | 121 | ||||
| -rw-r--r-- | README.md | 91 | ||||
| -rw-r--r-- | ccs811.lua | 66 | ||||
| -rw-r--r-- | init.lua | 130 |
7 files changed, 427 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..338c30b --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +config.lua diff --git a/.reuse/dep5 b/.reuse/dep5 new file mode 100644 index 0000000..c4e3880 --- /dev/null +++ b/.reuse/dep5 @@ -0,0 +1,9 @@ +Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/ + +Files: init.lua ccs811.lua +Copyright: 2024 Birte Kristina Friesel +License: BSD-2-Clause + +Files: README.md .gitignore +Copyright: 2024 Birte Kristina Friesel +License: CC0-1.0 diff --git a/LICENSES/BSD-2-Clause.txt b/LICENSES/BSD-2-Clause.txt new file mode 100644 index 0000000..5f662b3 --- /dev/null +++ b/LICENSES/BSD-2-Clause.txt @@ -0,0 +1,9 @@ +Copyright (c) <year> <owner> + +Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: + +1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. + +2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/LICENSES/CC0-1.0.txt b/LICENSES/CC0-1.0.txt new file mode 100644 index 0000000..0e259d4 --- /dev/null +++ b/LICENSES/CC0-1.0.txt @@ -0,0 +1,121 @@ +Creative Commons Legal Code + +CC0 1.0 Universal + + CREATIVE COMMONS CORPORATION IS NOT A LAW FIRM AND DOES NOT PROVIDE + LEGAL SERVICES. DISTRIBUTION OF THIS DOCUMENT DOES NOT CREATE AN + ATTORNEY-CLIENT RELATIONSHIP. CREATIVE COMMONS PROVIDES THIS + INFORMATION ON AN "AS-IS" BASIS. CREATIVE COMMONS MAKES NO WARRANTIES + REGARDING THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS + PROVIDED HEREUNDER, AND DISCLAIMS LIABILITY FOR DAMAGES RESULTING FROM + THE USE OF THIS DOCUMENT OR THE INFORMATION OR WORKS PROVIDED + HEREUNDER. + +Statement of Purpose + +The laws of most jurisdictions throughout the world automatically confer +exclusive Copyright and Related Rights (defined below) upon the creator +and subsequent owner(s) (each and all, an "owner") of an original work of +authorship and/or a database (each, a "Work"). + +Certain owners wish to permanently relinquish those rights to a Work for +the purpose of contributing to a commons of creative, cultural and +scientific works ("Commons") that the public can reliably and without fear +of later claims of infringement build upon, modify, incorporate in other +works, reuse and redistribute as freely as possible in any form whatsoever +and for any purposes, including without limitation commercial purposes. +These owners may contribute to the Commons to promote the ideal of a free +culture and the further production of creative, cultural and scientific +works, or to gain reputation or greater distribution for their Work in +part through the use and efforts of others. + +For these and/or other purposes and motivations, and without any +expectation of additional consideration or compensation, the person +associating CC0 with a Work (the "Affirmer"), to the extent that he or she +is an owner of Copyright and Related Rights in the Work, voluntarily +elects to apply CC0 to the Work and publicly distribute the Work under its +terms, with knowledge of his or her Copyright and Related Rights in the +Work and the meaning and intended legal effect of CC0 on those rights. + +1. 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Affirmer offers the Work as-is and makes no representations or + warranties of any kind concerning the Work, express, implied, + statutory or otherwise, including without limitation warranties of + title, merchantability, fitness for a particular purpose, non + infringement, or the absence of latent or other defects, accuracy, or + the present or absence of errors, whether or not discoverable, all to + the greatest extent permissible under applicable law. + c. Affirmer disclaims responsibility for clearing rights of other persons + that may apply to the Work or any use thereof, including without + limitation any person's Copyright and Related Rights in the Work. + Further, Affirmer disclaims responsibility for obtaining any necessary + consents, permissions or other rights required for any use of the + Work. + d. Affirmer understands and acknowledges that Creative Commons is not a + party to this document and has no duty or obligation with respect to + this CC0 or use of the Work. diff --git a/README.md b/README.md new file mode 100644 index 0000000..4793209 --- /dev/null +++ b/README.md @@ -0,0 +1,91 @@ +# ESP8266 Lua/NodeMCU module for CCS811 VOC sensors + +[esp8266-nodemcu-ccS811](https://finalrewind.org/projects/esp8266-nodemcu-ccs811/) +provides an ESP8266 NodeMCU Lua module (`ccs811.lua`) as well as MQTT / +HomeAssistant / InfluxDB gateway application example (`init.lua`) for +**CCS811** volatile organic compounds (VOC) sensors connected via I²C. The +application example assumes that an **HDC1080** sensor for temperature and +humidity compensation is available as well. + +## Dependencies + +ccs811.lua has been tested with Lua 5.1 on NodeMCU firmware 3.0.1 (Release +202112300746, float build). It requires the following modules. + +* bit +* i2c + +Most practical applications (such as the example in init.lua) also need the +following modules. + +* hdc1080 +* gpio +* mqtt +* node +* tmr +* wifi + +## Setup + +Connect the CCS811 sensor (or CCS811/HDC1080 combo board) to your +ESP8266/NodeMCU board as follows. + +* CCS811 GND → ESP8266/NodeMCU GND +* CCS811 VCC → ESP8266/NodeMCU 3V3 +* CCS811 SDA → NodeMCU D1 (ESP8266 GPIO5) +* CCS811 SCL → NodeMCU D2 (ESP8266 GPIO4) + +If you use different pins for SCL and SDA, you need to adjust the i2c.setup +call in the examples provided in this repository to reflect those changes. Keep +in mind that some ESP8266 pins must have well-defined logic levels at boot time +and may therefore be unsuitable for CCS811 connection. + +## Usage + +Copy **ccs811.lua** to your NodeMCU board and set it up as follows. + +```lua +ccs811 = require("ccs811") +i2c.setup(0, 1, 2, i2c.SLOW) +ccs811.start() + +-- can be called with up to 1 Hz +function some_timer_callback() + if ccs811.read() then + -- ccs811.eco2 : equivalent CO₂ (estimated from tvoc, unreliable) [ppm] + -- ccs811.tvoc : Total Volatile Organic Compounds [ppb] + -- ccs811.status : Status Register; see manual + -- ccs811.error : Error Register; see manual. error == 0 indicates that everything is alright. + -- optionally, if HDC1080 is available: + local t, h = hdc1080.read() + ccs811.setEnv(h, t) + end +end +``` + +The sensor performs an air quality measurement every second. + +## Application Example + +**init.lua** is an example application with HomeAssistant integration. +To use it, you need to create a **config.lua** file with WiFI and MQTT settings: + +```lua +station_cfg = {ssid = "...", pwd = "..."} +mqtt_host = "..." +``` + +Optionally, it can also publish readings to InfluxDB. +To do so, configure URL and attribute: + +```lua +influx_url = "..." +influx_attr = "..." +``` + +Readings will be published as `ccs811[influx_attr] eco2_ppm=%d,tvoc_ppb=%d,status=%d,error=%d`. +Unless `influx_attr = ''`, it must start with a comma, e.g. `influx_attr = ',device=' .. device_id`. + +## Images + + diff --git a/ccs811.lua b/ccs811.lua new file mode 100644 index 0000000..8753303 --- /dev/null +++ b/ccs811.lua @@ -0,0 +1,66 @@ +local ccs811 = {} +local device_address = 0x5a + +ccs811.mode = nil + +function ccs811.start() + local ret = true + i2c.start(0) + if not i2c.address(0, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(0, 0xf4) + i2c.stop(0) + return ret +end + +function ccs811.setMode(mode) + local ret = true + i2c.start(0) + if not i2c.address(0, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(0, 0x01, bit.lshift(mode, 4)) + i2c.stop(0) + ccs811.mode = mode + return ret +end + +function ccs811.setEnv(humi, temp) + local ret = true + i2c.start(0) + if not i2c.address(0, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(0, 0x05, math.floor(humi) * 2, 0, (math.floor(temp) + 25) * 2, 0) + i2c.stop(0) + return ret +end + +function ccs811.read() + local ret = true + if ccs811.mode == nil then + ccs811.setMode(1) + return + end + i2c.start(0) + if not i2c.address(0, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(0, 0x02) + i2c.start(0) + if not i2c.address(0, device_address, i2c.RECEIVER) then + ret = false + end + local data = i2c.read(0, 6) + i2c.stop(0) + + ccs811.eco2 = bit.lshift(string.byte(data, 1), 8) + string.byte(data, 2) + ccs811.tvoc = bit.lshift(string.byte(data, 3), 8) + string.byte(data, 4) + ccs811.status = string.byte(data, 5) + ccs811.err_id = string.byte(data, 6) + + return ret +end + +return ccs811 diff --git a/init.lua b/init.lua new file mode 100644 index 0000000..99af736 --- /dev/null +++ b/init.lua @@ -0,0 +1,130 @@ +publishing_mqtt = false +publishing_http = false + +watchdog = tmr.create() +push_timer = tmr.create() +chip_id = string.format("%06X", node.chipid()) +device_id = "esp8266_" .. chip_id +mqtt_prefix = "sensor/" .. device_id +mqttclient = mqtt.Client(device_id, 120) + +dofile("config.lua") + +print("CCS811 " .. chip_id) + +ledpin = 4 +gpio.mode(ledpin, gpio.OUTPUT) +gpio.write(ledpin, 0) + +ccs811 = require("ccs811") +i2c.setup(0, 1, 2, i2c.SLOW) + +function log_restart() + print("Network error " .. wifi.sta.status()) +end + +function setup_client() + print("Connected") + gpio.write(ledpin, 1) + publishing_mqtt = true + mqttclient:publish(mqtt_prefix .. "/state", "online", 0, 1, function(client) + publishing_mqtt = false + hdc1080.setup() + ccs811.start() + push_timer:start() + end) +end + +function connect_mqtt() + print("IP address: " .. wifi.sta.getip()) + print("Connecting to MQTT " .. mqtt_host) + mqttclient:on("connect", hass_register) + mqttclient:on("offline", log_restart) + mqttclient:lwt(mqtt_prefix .. "/state", "offline", 0, 1) + mqttclient:connect(mqtt_host) +end + +function connect_wifi() + print("WiFi MAC: " .. wifi.sta.getmac()) + print("Connecting to ESSID " .. station_cfg.ssid) + wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, connect_mqtt) + wifi.eventmon.register(wifi.eventmon.STA_DHCP_TIMEOUT, log_restart) + wifi.eventmon.register(wifi.eventmon.STA_DISCONNECTED, log_restart) + wifi.setmode(wifi.STATION) + wifi.sta.config(station_cfg) + wifi.sta.connect() +end + +function push_data() + local t, h = hdc1080.read() + local json_str = string.format('{"temperature_degc": %.1f, "humidity_relpercent": %.1f', t, h) + local influx_str = string.format("temperature_degc=%.1f,humidity_relpercent=%.1f", t, h) + if ccs811.read() then + json_str = json_str .. string.format(', "eco2_ppm": %d, "tvoc_ppb": %d, "status": "0x%02x", "error": "0x%02x"', ccs811.eco2, ccs811.tvoc, ccs811.status, ccs811.err_id) + influx_str = influx_str .. string.format(',eco2_ppm=%d,tvoc_ppb=%d,status=%d,error=%d', ccs811.eco2, ccs811.tvoc, ccs811.status, ccs811.err_id) + ccs811.setEnv(h, t) + else + json_str = json_str .. ', "status": "Initializing", "error": "0x00"' + end + json_str = json_str .. string.format(', "rssi_dbm": %d}', wifi.sta.getrssi()) + if not publishing_mqtt then + publishing_mqtt = true + watchdog:start(true) + gpio.write(ledpin, 0) + mqttclient:publish(mqtt_prefix .. "/data", json_str, 0, 0, function(client) + publishing_mqtt = false + if influx_url and influx_attr then + publish_influx(influx_str) + else + gpio.write(ledpin, 1) + collectgarbage() + end + end) + end +end + +function publish_influx(payload) + if not publishing_http then + publishing_http = true + http.post(influx_url, influx_header, "ccs811" .. influx_attr .. " " .. payload, function(code, data) + publishing_http = false + gpio.write(ledpin, 1) + collectgarbage() + end) + end +end + +function hass_register() + local hass_device = string.format('{"connections":[["mac","%s"]],"identifiers":["%s"],"model":"ESP8266 + HDC1080 + CCS811","name":"CCS811 %s","manufacturer":"derf"}', wifi.sta.getmac(), device_id, chip_id) + local hass_entity_base = string.format('"device":%s,"state_topic":"%s/data","expire_after":120', hass_device, mqtt_prefix) + local hass_temp = string.format('{%s,"name":"Temperature","object_id":"%s_temp","unique_id":"%s_temp","device_class":"temperature","unit_of_measurement":"°c","value_template":"{{value_json.temperature_degc}}","entity_category":"diagnostic"}', hass_entity_base, device_id, device_id) + local hass_humi = string.format('{%s,"name":"Humidity","object_id":"%s_humidity","unique_id":"%s_humidity","device_class":"humidity","unit_of_measurement":"%%","value_template":"{{value_json.humidity_relpercent}}","entity_category":"diagnostic"}', hass_entity_base, device_id, device_id) + --local hass_eco2 = string.format('{%s,"name":"eCO₂","object_id":"%s_eco2","unique_id":"%s_eco2","device_class":"carbon_dioxide","unit_of_measurement":"ppm","value_template":"{{value_json.eco2_ppm}}"}', hass_entity_base, device_id, device_id) + local hass_voc = string.format('{%s,"name":"VOC","object_id":"%s_voc","unique_id":"%s_voc","unit_of_measurement":"ppb","icon":"mdi:air-filter","value_template":"{{value_json.tvoc_ppb}}"}', hass_entity_base, device_id, device_id) + local hass_status = string.format('{%s,"name":"Status","object_id":"%s_status","unique_id":"%s_status","icon":"mdi:information","value_template":"{{value_json.status}}","entity_category":"diagnostic"}', hass_entity_base, device_id, device_id) + local hass_error = string.format('{%s,"name":"Error","object_id":"%s_error","unique_id":"%s_error","icon":"mdi:alert-circle","value_template":"{{value_json.error}}","entity_category":"diagnostic"}', hass_entity_base, device_id, device_id) + local hass_rssi = string.format('{%s,"name":"RSSI","object_id":"%s_rssi","unique_id":"%s_rssi","device_class":"signal_strength","unit_of_measurement":"dBm","value_template":"{{value_json.rssi_dbm}}","entity_category":"diagnostic"}', hass_entity_base, device_id, device_id) + + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/temperature/config", hass_temp, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/humidity/config", hass_humi, 0, 1, function(client) + --mqttclient:publish("homeassistant/sensor/" .. device_id .. "/eco2/config", hass_eco2, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/tvoc/config", hass_voc, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/status/config", hass_status, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/error/config", hass_error, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/rssi/config", hass_rssi, 0, 1, function(client) + collectgarbage() + setup_client() + end) + end) + end) + end) + --end) + end) + end) +end + +watchdog:register(180 * 1000, tmr.ALARM_SEMI, node.restart) +push_timer:register(10 * 1000, tmr.ALARM_AUTO, push_data) +watchdog:start() + +connect_wifi() |