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/ds18b20/ds18b20.c

@@ -1,4 +1,12 @@
-int test() {
-  int i = 5;
-  return i;
+#include "ds18b20.h"
+#include "driver/gpio.h"
+#include "sdkconfig.h"
+
+#ifdef CONFIG_DS18B20_ENABLED
+
+int ds18b20_read(void) {
+  esp_err_t ret = gpio_set_pull_mode(CONFIG_DS18B20_GPIO_PIN, GPIO_PULLUP_ONLY);
+  return DS18B20_OK;
 }
+
+#endif /* CONFIG_DS18B20_ENABLED */