From 4528c766056caec98e2ac4ca1e881538d57faec9 Mon Sep 17 00:00:00 2001 From: Birte Kristina Friesel Date: Mon, 15 Jan 2024 18:40:49 +0100 Subject: Initial commit --- .gitignore | 1 + .reuse/dep5 | 9 ++++ LICENSES/BSD-2-Clause.txt | 9 ++++ LICENSES/CC0-1.0.txt | 121 ++++++++++++++++++++++++++++++++++++++++++++++ README.md | 86 ++++++++++++++++++++++++++++++++ init.lua | 121 ++++++++++++++++++++++++++++++++++++++++++++++ max44006.lua | 64 ++++++++++++++++++++++++ 7 files changed, 411 insertions(+) create mode 100644 .gitignore create mode 100644 .reuse/dep5 create mode 100644 LICENSES/BSD-2-Clause.txt create mode 100644 LICENSES/CC0-1.0.txt create mode 100644 README.md create mode 100644 init.lua create mode 100644 max44006.lua 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..4728c2e --- /dev/null +++ b/.reuse/dep5 @@ -0,0 +1,9 @@ +Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/ + +Files: init.lua max44006.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) + +Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: + +1. 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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..97d8646 --- /dev/null +++ b/README.md @@ -0,0 +1,86 @@ +# ESP8266 Lua/NodeMCU module for MAX44006 illuminance sensors + +This repository contains an ESP8266 NodeMCU Lua module (`max44006.lua`) as well +as MQTT / HomeAssistant / InfluxDB integration example (`init.lua`) for +**MAX44006** irradiance sensors connected via I²C. + +## Dependencies + +max44006.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. + +* gpio +* mqtt +* node +* tmr +* wifi + +## Setup + +Connect the MAX44006 sensor to your ESP8266/NodeMCU board as follows. + +* MAX44006 GND → ESP8266/NodeMCU GND +* MAX44006 VCC → ESP8266/NodeMCU 3V3 +* MAX44006 SDA → NodeMCU D1 (ESP8266 GPIO5) +* MAX44006 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 MAX44006 connection. + +## Usage + +Copy **max44006.lua** to your NodeMCU board and set it up as follows. + +```lua +max44006 = require("max44006") +i2c.setup(0, 1, 2, i2c.SLOW) +max44006.start() + +-- can be called with up to 10 Hz +function some_timer_callback() + if max44006.read() then + -- All values are float + -- Maximum value is for 1677 blue and 8388 for others + -- max44006.red : Irradiance on Red channel [µW/cm²] + -- max44006.green : Irradiance on Green channel [µW/cm²] + -- max44006.blue : Irradiance on Blue channel [µW/cm²] + -- max44006.clear : Irradiance on Clear channel [µW/cm²] + -- max44006.ir : Irradiance on IR channel [µW/cm²] + else + print("MAX44006 error") + end +end +``` + +## 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 `max44006[influx_attr] red_uwcm2=%f,green_uwcm2=%f,blue_uwcm2=%f,clear_uwcm2=%f,ir_uwcm2=%f`. +So, unless `influx_attr = ''`, it must start with a comma, e.g. `influx_attr = ',device=' .. device_id`. + +## Images + +![](https://finalrewind.org/projects/esp8266-nodemcu-max44006/media/hass.png) diff --git a/init.lua b/init.lua new file mode 100644 index 0000000..a16478d --- /dev/null +++ b/init.lua @@ -0,0 +1,121 @@ +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("MAX44006 " .. chip_id) + +ledpin = 4 +gpio.mode(ledpin, gpio.OUTPUT) +gpio.write(ledpin, 0) + +max44006 = require("max44006") +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) + max44006.start() + publishing_mqtt = true + mqttclient:publish(mqtt_prefix .. "/state", "online", 0, 1, function(client) + publishing_mqtt = false + 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() + if max44006.read() then + local json_str = string.format('{"red_uwcm2": %f, "green_uwcm2": %f, "blue_uwcm2": %f, "clear_uwcm2": %f, "ir_uwcm2": %f, "rssi_dbm": %d}', max44006.red, max44006.green, max44006.blue, max44006.clear, max44006.ir, wifi.sta.getrssi()) + local influx_str = string.format("red_uwcm2=%f,green_uwcm2=%f,blue_uwcm2=%f,clear_uwcm2=%f,ir_uwcm2=%f", max44006.red, max44006.green, max44006.blue, max44006.clear, max44006.ir) + 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 and influx_str then + publish_influx(influx_str) + else + gpio.write(ledpin, 1) + collectgarbage() + end + end) + end + else + print("MAX44006 error") + end +end + +function publish_influx(payload) + if not publishing_http then + publishing_http = true + http.post(influx_url, influx_header, "max44006" .. 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 + MAX44006","name":"MAX44006 %s","manufacturer":"derf"}', wifi.sta.getmac(), device_id, chip_id) + local hass_entity_base = string.format('"device":%s,"state_topic":"%s/data","expire_after":600', hass_device, mqtt_prefix) + local hass_red = string.format('{%s,"name":"Red","object_id":"%s_red","unique_id":"%s_red","device_class":"irradiance","unit_of_measurement":"µW/cm²","value_template":"{{value_json.red_uwcm2}}"}', hass_entity_base, device_id, device_id) + local hass_green = string.format('{%s,"name":"Green","object_id":"%s_green","unique_id":"%s_green","device_class":"irradiance","unit_of_measurement":"µW/cm²","value_template":"{{value_json.green_uwcm2}}"}', hass_entity_base, device_id, device_id) + local hass_blue = string.format('{%s,"name":"Blue","object_id":"%s_blue","unique_id":"%s_blue","device_class":"irradiance","unit_of_measurement":"µW/cm²","value_template":"{{value_json.blue_uwcm2}}"}', hass_entity_base, device_id, device_id) + local hass_clear = string.format('{%s,"name":"Clear","object_id":"%s_clear","unique_id":"%s_clear","device_class":"irradiance","unit_of_measurement":"µW/cm²","value_template":"{{value_json.clear_uwcm2}}"}', hass_entity_base, device_id, device_id) + local hass_ir = string.format('{%s,"name":"IR","object_id":"%s_ir","unique_id":"%s_ir","device_class":"irradiance","unit_of_measurement":"µW/cm²","value_template":"{{value_json.ir_uwcm2}}"}', 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 .. "/irradiance_red/config", hass_red, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/irradiance_green/config", hass_green, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/irradiance_blue/config", hass_blue, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/irradiance_clear/config", hass_clear, 0, 1, function(client) + mqttclient:publish("homeassistant/sensor/" .. device_id .. "/irradiance_ir/config", hass_ir, 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 + +watchdog:register(180 * 1000, tmr.ALARM_SEMI, node.restart) +push_timer:register(20 * 1000, tmr.ALARM_AUTO, push_data) +watchdog:start() + +connect_wifi() diff --git a/max44006.lua b/max44006.lua new file mode 100644 index 0000000..27181d1 --- /dev/null +++ b/max44006.lua @@ -0,0 +1,64 @@ +local max44006 = {} +local device_address = 0x45 + +max44006.bus_id = 0 + +function max44006.writeReg(reg, data) + ret = true + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(max44006.bus_id, reg, data) + i2c.stop(max44006.bus_id) + return ret +end + +function max44006.readReg(reg, len) + ret = true + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(max44006.bus_id, reg) + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.RECEIVER) then + ret = false + end + local data = i2c.read(max44006.bus_id, len) + i2c.stop(max44006.bus_id) + return ret, data +end + +function max44006.start() + max44006.readReg(0x00, 1) + max44006.readReg(0x00, 1) + max44006.writeReg(0x01, 0x20) + max44006.writeReg(0x02, 0x03) +end + +function max44006.read() + ret = true + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.TRANSMITTER) then + ret = false + end + i2c.write(max44006.bus_id, {0x04}) + --i2c.stop(max44006.bus_id) + i2c.start(max44006.bus_id) + if not i2c.address(max44006.bus_id, device_address, i2c.RECEIVER) then + ret = false + end + local data = i2c.read(max44006.bus_id, 10) + i2c.stop(max44006.bus_id) + + local mul = 0.512 + max44006.clear = (bit.lshift(string.byte(data, 1), 8) + string.byte(data, 2)) * mul + max44006.red = (bit.lshift(string.byte(data, 3), 8) + string.byte(data, 4)) * mul + max44006.green = (bit.lshift(string.byte(data, 5), 8) + string.byte(data, 6)) * mul + max44006.blue = (bit.lshift(string.byte(data, 7), 8) + string.byte(data, 8)) * mul + max44006.ir = (bit.lshift(string.byte(data, 9), 8) + string.byte(data, 10)) * mul + return ret +end + +return max44006 -- cgit v1.2.3