Add MCP47A1 DAC output (#3014)

CODEOWNERS

@@ -96,6 +96,7 @@ esphome/components/mcp23x08_base/* @jesserockz
 esphome/components/mcp23x17_base/* @jesserockz
 esphome/components/mcp23xxx_base/* @jesserockz
 esphome/components/mcp2515/* @danielschramm @mvturnho
+esphome/components/mcp47a1/* @jesserockz
 esphome/components/mcp9808/* @k7hpn
 esphome/components/md5/* @esphome/core
 esphome/components/mdns/* @esphome/core

esphome/components/mcp47a1/mcp47a1.cpp

@@ -0,0 +1,21 @@
+#include "mcp47a1.h"
+#include "esphome/core/helpers.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace mcp47a1 {
+
+static const char *const TAG = "mcp47a1";
+
+void MCP47A1::dump_config() {
+  ESP_LOGCONFIG(TAG, "MCP47A1 Output:");
+  LOG_I2C_DEVICE(this);
+}
+
+void MCP47A1::write_state(float state) {
+  const uint8_t value = remap(state, 0.0f, 1.0f, 63, 0);
+  this->write_byte(0, value);
+}
+
+}  // namespace mcp47a1
+}  // namespace esphome

esphome/components/mcp47a1/mcp47a1.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "esphome/components/i2c/i2c.h"
+#include "esphome/components/output/float_output.h"
+#include "esphome/core/component.h"
+
+namespace esphome {
+namespace mcp47a1 {
+
+class MCP47A1 : public Component, public output::FloatOutput, public i2c::I2CDevice {
+ public:
+  void dump_config() override;
+  void write_state(float state) override;
+};
+
+}  // namespace mcp47a1
+}  // namespace esphome

esphome/components/mcp47a1/output.py

@@ -0,0 +1,27 @@
+import esphome.config_validation as cv
+import esphome.codegen as cg
+from esphome.components import output, i2c
+from esphome.const import CONF_ID
+
+CODEOWNERS = ["@jesserockz"]
+DEPENDENCIES = ["i2c"]
+
+mcp47a1_ns = cg.esphome_ns.namespace("mcp47a1")
+MCP47A1 = mcp47a1_ns.class_("MCP47A1", output.FloatOutput, cg.Component, i2c.I2CDevice)
+
+CONFIG_SCHEMA = (
+    output.FLOAT_OUTPUT_SCHEMA.extend(
+        {
+            cv.Required(CONF_ID): cv.declare_id(MCP47A1),
+        }
+    )
+    .extend(cv.COMPONENT_SCHEMA)
+    .extend(i2c.i2c_device_schema(0x2E))
+)
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    await i2c.register_i2c_device(var, config)
+    await output.register_output(var, config)

tests/test5.yaml

@@ -72,6 +72,9 @@ output:
     channel: 0
     max_power: 0.8
 
+  - platform: mcp47a1
+    id: output_mcp47a1
+
 demo:
 
 esp32_ble: