Add MCP4725 DAC Component (#1418)

* Add MCP4725 DAC

* Fix lint

* Fix lint

* Fix lint

* Lint & cleanup

* Lint again

* One more lint

* add test

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

esphome/components/mcp4725/mcp4725.cpp

@@ -0,0 +1,38 @@
+#include "mcp4725.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace mcp4725 {
+
+static const char *TAG = "mcp4725";
+
+void MCP4725::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up MCP4725 (0x%02X)...", this->address_);
+
+  this->parent_->raw_begin_transmission(this->address_);
+
+  if (!this->parent_->raw_end_transmission(this->address_)) {
+    this->error_code_ = COMMUNICATION_FAILED;
+    this->mark_failed();
+
+    return;
+  }
+}
+
+void MCP4725::dump_config() {
+  LOG_I2C_DEVICE(this);
+
+  if (this->error_code_ == COMMUNICATION_FAILED) {
+    ESP_LOGE(TAG, "Communication with MCP4725 failed!");
+  }
+}
+
+// https://learn.sparkfun.com/tutorials/mcp4725-digital-to-analog-converter-hookup-guide?_ga=2.176055202.1402343014.1607953301-893095255.1606753886
+void MCP4725::write_state(float state) {
+  const uint16_t value = (uint16_t) round(state * (pow(2, MCP4725_RES) - 1));
+
+  this->write_byte_16(64, value << 4);
+}
+
+}  // namespace mcp4725
+}  // namespace esphome

esphome/components/mcp4725/mcp4725.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "esphome/components/output/float_output.h"
+#include "esphome/core/component.h"
+#include "esphome/components/i2c/i2c.h"
+
+static const uint8_t MCP4725_ADDR = 0x60;
+static const uint8_t MCP4725_RES = 12;
+
+namespace esphome {
+namespace mcp4725 {
+class MCP4725 : public Component, public output::FloatOutput, public i2c::I2CDevice {
+ public:
+  void setup() override;
+  void dump_config() override;
+  void write_state(float state) override;
+
+ protected:
+  enum ErrorCode { NONE = 0, COMMUNICATION_FAILED } error_code_{NONE};
+};
+
+}  // namespace mcp4725
+}  // namespace esphome

esphome/components/mcp4725/output.py

@@ -0,0 +1,20 @@
+import esphome.config_validation as cv
+import esphome.codegen as cg
+from esphome.components import output, i2c
+from esphome.const import CONF_ID
+
+DEPENDENCIES = ['i2c']
+
+mcp4725 = cg.esphome_ns.namespace('mcp4725')
+MCP4725 = mcp4725.class_('MCP4725', output.FloatOutput, cg.Component, i2c.I2CDevice)
+
+CONFIG_SCHEMA = output.FLOAT_OUTPUT_SCHEMA.extend({
+    cv.Required(CONF_ID): cv.declare_id(MCP4725),
+}).extend(cv.COMPONENT_SCHEMA).extend(i2c.i2c_device_schema(0x60))
+
+
+def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    yield cg.register_component(var, config)
+    yield i2c.register_i2c_device(var, config)
+    yield output.register_output(var, config)

tests/test1.yaml

@@ -1192,6 +1192,8 @@ output:
   - platform: esp32_dac
     pin: GPIO25
     id: dac_output
+  - platform: mcp4725
+    id: mcp4725_dac_output
 
 e131:
 
@@ -1561,6 +1563,9 @@ switch:
       - output.set_level:
           id: dac_output
           level: !lambda 'return 0.5;'
+      - output.set_level:
+          id: mcp4725_dac_output
+          level: !lambda 'return 0.5;'
     turn_off_action:
       - switch.turn_on: living_room_lights_off
     restore_state: False