Add ADS1115 usermod (#2752)

Co-authored-by: Christian Schwinne <dev.aircoookie@gmail.com>

platformio.ini

@@ -115,6 +115,8 @@ build_flags =
   -D DECODE_LG=true
   -DWLED_USE_MY_CONFIG
   ; -D USERMOD_SENSORSTOMQTT
+  #For ADS1115 sensor uncomment following
+  ; -D USERMOD_ADS1115
 
 build_unflags =
 
@@ -177,6 +179,9 @@ lib_deps =
     ; adafruit/Adafruit BMP280 Library @ 2.1.0
     ; adafruit/Adafruit CCS811 Library @ 1.0.4
     ; adafruit/Adafruit Si7021 Library @ 1.4.0
+  #For ADS1115 sensor uncomment following
+    ; adafruit/Adafruit BusIO @ 1.13.2
+    ; adafruit/Adafruit ADS1X15 @ 2.4.0
 
 extra_scripts = ${scripts_defaults.extra_scripts}
 

usermods/ADS1115_v2/ChannelSettings.h

@@ -0,0 +1,15 @@
+#include "wled.h"
+
+namespace ADS1115
+{
+  struct ChannelSettings {
+    const String settingName;
+    bool isEnabled;
+    String name;
+    String units;
+    const uint16_t mux;
+    float multiplier;
+    float offset;
+    uint8_t decimals;
+  };
+}

usermods/ADS1115_v2/readme.md

@@ -0,0 +1,10 @@
+# ADS1115 16-Bit ADC with four inputs
+
+This usermod will read from an ADS1115 ADC. The voltages are displayed in the Info section of the web UI.
+
+Configuration is all completed via the Usermod menu. There are no settings to set in code!
+
+## Installation 
+
+Add the build flag `-D USERMOD_ADS1115` to your platformio environment.
+Uncomment libraries with comment `#For ADS1115 sensor uncomment following`

usermods/ADS1115_v2/usermod_ads1115.h

@@ -0,0 +1,255 @@
+#pragma once
+
+#include "wled.h"
+#include <Adafruit_ADS1X15.h>
+#include <math.h>
+
+#include "ChannelSettings.h"
+
+using namespace ADS1115;
+
+class ADS1115Usermod : public Usermod {
+  public:
+    void setup() {
+      ads.setGain(GAIN_ONE);        // 1x gain   +/- 4.096V
+
+      if (!ads.begin()) {
+        Serial.println("Failed to initialize ADS");
+        return;
+      }
+
+      if (!initChannel()) {
+        isInitialized = true;
+        return;
+      }
+
+      startReading();
+
+      isEnabled = true;
+      isInitialized = true;
+    }
+
+    void loop() {
+      if (isEnabled && millis() - lastTime > loopInterval) {
+        lastTime = millis();
+
+        // If we don't have new data, skip this iteration.
+        if (!ads.conversionComplete()) {
+          return;
+        }
+
+        updateResult();
+        moveToNextChannel();
+        startReading();
+      }
+    }
+
+    void addToJsonInfo(JsonObject& root)
+    {
+      if (!isEnabled) {
+        return;
+      }
+
+      JsonObject user = root[F("u")];
+      if (user.isNull()) user = root.createNestedObject(F("u"));
+
+      for (uint8_t i = 0; i < channelsCount; i++) {
+        ChannelSettings* settingsPtr = &(channelSettings[i]);
+
+        if (!settingsPtr->isEnabled) {
+          continue;
+        }
+
+        JsonArray lightArr = user.createNestedArray(settingsPtr->name); //name
+        float value = round((readings[i] + settingsPtr->offset) * settingsPtr->multiplier, settingsPtr->decimals);
+        lightArr.add(value); //value
+        lightArr.add(" " + settingsPtr->units); //unit
+      }
+    }
+
+    void addToConfig(JsonObject& root)
+    {
+      JsonObject top = root.createNestedObject(F("ADC ADS1115"));
+      
+      for (uint8_t i = 0; i < channelsCount; i++) {
+        ChannelSettings* settingsPtr = &(channelSettings[i]);
+        JsonObject channel = top.createNestedObject(settingsPtr->settingName);
+        channel[F("Enabled")] = settingsPtr->isEnabled;
+        channel[F("Name")] = settingsPtr->name;
+        channel[F("Units")] = settingsPtr->units;
+        channel[F("Multiplier")] = settingsPtr->multiplier;
+        channel[F("Offset")] = settingsPtr->offset;
+        channel[F("Decimals")] = settingsPtr->decimals;
+      }
+
+      top[F("Loop Interval")] = loopInterval;
+    }
+
+    bool readFromConfig(JsonObject& root)
+    {
+      JsonObject top = root[F("ADC ADS1115")];
+
+      bool configComplete = !top.isNull();
+      bool hasEnabledChannels = false;
+
+      for (uint8_t i = 0; i < channelsCount && configComplete; i++) {
+        ChannelSettings* settingsPtr = &(channelSettings[i]);
+        JsonObject channel = top[settingsPtr->settingName];
+
+        configComplete &= !channel.isNull();
+
+        configComplete &= getJsonValue(channel[F("Enabled")], settingsPtr->isEnabled);
+        configComplete &= getJsonValue(channel[F("Name")], settingsPtr->name);
+        configComplete &= getJsonValue(channel[F("Units")], settingsPtr->units);
+        configComplete &= getJsonValue(channel[F("Multiplier")], settingsPtr->multiplier);
+        configComplete &= getJsonValue(channel[F("Offset")], settingsPtr->offset);
+        configComplete &= getJsonValue(channel[F("Decimals")], settingsPtr->decimals);
+
+        hasEnabledChannels |= settingsPtr->isEnabled;
+      }
+
+      configComplete &= getJsonValue(top[F("Loop Interval")], loopInterval);
+
+      isEnabled = isInitialized && configComplete && hasEnabledChannels;
+
+      return configComplete;
+    }
+
+    uint16_t getId()
+    {
+      return USERMOD_ID_ADS1115;
+    }
+
+  private:
+    static const uint8_t channelsCount = 8;
+
+    ChannelSettings channelSettings[channelsCount] = {
+      {
+        "Differential reading from AIN0 (P) and AIN1 (N)",
+        false,
+        "Differential AIN0 AIN1",
+        "V",
+        ADS1X15_REG_CONFIG_MUX_DIFF_0_1,
+        1,
+        0,
+        3
+      },
+      {
+        "Differential reading from AIN0 (P) and AIN3 (N)",
+        false,
+        "Differential AIN0 AIN3",
+        "V",
+        ADS1X15_REG_CONFIG_MUX_DIFF_0_3,
+        1,
+        0,
+        3
+      },
+      {
+        "Differential reading from AIN1 (P) and AIN3 (N)",
+        false,
+        "Differential AIN1 AIN3",
+        "V",
+        ADS1X15_REG_CONFIG_MUX_DIFF_1_3,
+        1,
+        0,
+        3
+      },
+      {
+        "Differential reading from AIN2 (P) and AIN3 (N)",
+        false,
+        "Differential AIN2 AIN3",
+        "V",
+        ADS1X15_REG_CONFIG_MUX_DIFF_2_3,
+        1,
+        0,
+        3
+      },
+      {
+        "Single-ended reading from AIN0",
+        false,
+        "Single-ended AIN0",
+        "V",
+        ADS1X15_REG_CONFIG_MUX_SINGLE_0,
+        1,
+        0,
+        3
+      },
+      {
+        "Single-ended reading from AIN1",
+        false,
+        "Single-ended AIN1",
+        "V",
+        ADS1X15_REG_CONFIG_MUX_SINGLE_1,
+        1,
+        0,
+        3
+      },
+      {
+        "Single-ended reading from AIN2",
+        false,
+        "Single-ended AIN2",
+        "V",
+        ADS1X15_REG_CONFIG_MUX_SINGLE_2,
+        1,
+        0,
+        3
+      },
+      {
+        "Single-ended reading from AIN3",
+        false,
+        "Single-ended AIN3",
+        "V",
+        ADS1X15_REG_CONFIG_MUX_SINGLE_3,
+        1,
+        0,
+        3
+      },
+    };
+    float readings[channelsCount] = {0, 0, 0, 0, 0, 0, 0, 0};
+
+    unsigned long loopInterval = 1000;
+    unsigned long lastTime = 0;
+
+    Adafruit_ADS1115 ads;
+    uint8_t activeChannel;
+
+    bool isEnabled = false;
+    bool isInitialized = false;
+
+    static float round(float value, uint8_t decimals) {
+      return roundf(value * powf(10, decimals)) / powf(10, decimals);
+    }
+
+    bool initChannel() {
+      for (uint8_t i = 0; i < channelsCount; i++) {
+        if (channelSettings[i].isEnabled) {
+          activeChannel = i;
+          return true;
+        }
+      }
+
+      activeChannel = 0;
+      return false;
+    }
+
+    void moveToNextChannel() {
+      uint8_t oldActiveChannel = activeChannel;
+
+      do
+      {
+        if (++activeChannel >= channelsCount){
+          activeChannel = 0;
+        }
+      }
+      while (!channelSettings[activeChannel].isEnabled && oldActiveChannel != activeChannel);
+    }
+
+    void startReading() {
+      ads.startADCReading(channelSettings[activeChannel].mux, /*continuous=*/false);
+    }
+
+    void updateResult() {
+        int16_t results = ads.getLastConversionResults();
+        readings[activeChannel] = ads.computeVolts(results);
+    }
+};

wled00/const.h

@@ -95,6 +95,7 @@
 #define USERMOD_ID_AUDIOREACTIVE         32     //Usermod "audioreactive.h"
 #define USERMOD_ID_ANALOG_CLOCK          33     //Usermod "Analog_Clock.h"
 #define USERMOD_ID_PING_PONG_CLOCK       34     //Usermod "usermod_v2_ping_pong_clock.h"
+#define USERMOD_ID_ADS1115               35     //Usermod "usermod_ads1115.h"
 
 //Access point behavior
 #define AP_BEHAVIOR_BOOT_NO_CONN          0     //Open AP when no connection after boot

wled00/usermods_list.cpp

@@ -147,6 +147,10 @@
 #include "../usermods/usermod_v2_ping_pong_clock/usermod_v2_ping_pong_clock.h"
 #endif
 
+#ifdef USERMOD_ADS1115
+#include "../usermods/ADS1115_v2/usermod_ads1115.h"
+#endif
+
 void registerUsermods()
 {
 /*
@@ -282,4 +286,8 @@ void registerUsermods()
   #ifdef USERMOD_PING_PONG_CLOCK
   usermods.add(new PingPongClockUsermod());
   #endif
+  
+  #ifdef USERMOD_ADS1115
+  usermods.add(new ADS1115Usermod());
+  #endif
 }