Started on DS18B20 and PMS5003

Didn't realise DS18B20 was 1-Wire

Will probably just find a library for that one - can't be arsed
doing more bit banging

components/pms5003/pms5003.c

@@ -1,4 +1,29 @@
-int test() {
-  int i = 5;
-  return i;
+#include "pms5003.h"
+#include "driver/uart.h"
+#include "hal/uart_types.h"
+
+#define START_CHAR_1 0x42
+#define START_CHAR_2 0x4d
+
+#define DEFAULT_BAUD 9600
+
+static const char* TAG = "PMS5003";
+
+pms5003_err pms5003_init() {
+  const uart_port_t uart_num = CONFIG_PMS5003_UART_PORT;
+  uart_set_pin(uart_num, CONFIG_PMS5003_UART_TX, CONFIG_PMS5003_UART_RX, -1, -1);
+  uart_config_t uart_config = {
+    .baud_rate = DEFAULT_BAUD,
+    .data_bits = UART_DATA_8_BITS,
+    .parity = UART_PARITY_DISABLE,
+    .stop_bits = UART_STOP_BITS_1,
+    .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
+    .rx_flow_ctrl_thresh = 122,
+  };
+  return PMS5003_OK;
+}
+
+pms5003_err pms5003_read(void) {
+
+  return PMS5003_OK;
 }