Add PZEM004T/PZEMAC/PZEMDC Support (#587)

* Add PZEM004T Support * Don't flush as much * Update pzem004t.cpp * Add generalized modbus * Add PZEMAC * Add PZEMDC * Fix file modes * Lint * Fix * Fix * Add check_uart_settings
2026-06-01 10:38:27 +02:00 · 2019-10-20 19:24:20 +02:00
parent f1e00f8c8e
commit e077ad56bd
26 changed files with 738 additions and 7 deletions
@@ -0,0 +1,52 @@
+#include "pzemdc.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace pzemdc {
+
+static const char *TAG = "pzemdc";
+
+static const uint8_t PZEM_CMD_READ_IN_REGISTERS = 0x04;
+static const uint8_t PZEM_REGISTER_COUNT = 10;  // 10x 16-bit registers
+
+void PZEMDC::on_modbus_data(const std::vector<uint8_t> &data) {
+  if (data.size() < 16) {
+    ESP_LOGW(TAG, "Invalid size for PZEM DC!");
+    return;
+  }
+
+  // See https://github.com/esphome/feature-requests/issues/49#issuecomment-538636809
+  //           0     1     2     3     4     5     6     7           = ModBus register
+  //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20  = Buffer index
+  // 01 04 10 05 40 00 0A 00 0D 00 00 00 02 00 00 00 00 00 00 D6 29
+  // Id Cc Sz Volt- Curre Power------ Energy----- HiAlm LoAlm Crc--
+
+  auto pzem_get_16bit = [&](size_t i) -> uint16_t {
+    return (uint16_t(data[i + 0]) << 8) | (uint16_t(data[i + 1]) << 0);
+  };
+  auto pzem_get_32bit = [&](size_t i) -> uint32_t {
+    return (uint32_t(pzem_get_16bit(i + 2)) << 16) | (uint32_t(pzem_get_16bit(i + 0)) << 0);
+  };
+
+  uint16_t raw_voltage = pzem_get_16bit(0);
+  float voltage = raw_voltage / 100.0f;  // max 655.35 V
+
+  uint16_t raw_current = pzem_get_16bit(2);
+  float current = raw_current / 100.0f;  // max 655.35 A
+
+  uint32_t raw_power = pzem_get_32bit(4);
+  float power = raw_power / 10.0f;  // max 429496729.5 W
+
+  ESP_LOGD(TAG, "PZEM DC: V=%.1f V, I=%.3f A, P=%.1f W", voltage, current, power);
+  if (this->voltage_sensor_ != nullptr)
+    this->voltage_sensor_->publish_state(voltage);
+  if (this->current_sensor_ != nullptr)
+    this->current_sensor_->publish_state(current);
+  if (this->power_sensor_ != nullptr)
+    this->power_sensor_->publish_state(power);
+}
+
+void PZEMDC::update() { this->send(PZEM_CMD_READ_IN_REGISTERS, 0, 8); }
+
+}  // namespace pzemdc
+}  // namespace esphome