The station is based on an ESP-01 WiFi module connected to a BME280 (air pressure, humidity and temperature) and a MAX44009 (light) sensor module using the I2C bus. It operates in deep sleep mode to conserve power and transmits its data over the WIFI at 15 minute wake up intervals. It runs on one 18650 rechargeable battery via a MCP1700 3.3V regulator as the ESP-01 has a maximum recommended voltage of 3.3V.
The software now alerts by email when battery voltage starts to drop.
Note - temperature recording should now be more accurate as the new enclosure shades the sensor more effectively. Light intensity measurement has been improved by having the sensor external to the rest of the station and connected by a lead. It is still incorrect. The metal case is sealed and the glass lens fogs over.
To see how the weather station was put together follow this link - Construction
Battery voltage = 3.3 V
Last read - 2025-03-25 02:58:58
| Pressure | Temperature | Humidity | Light Intensity |
| 1015.1 mb | 8.6 °C | 93.3 % | 0.0 lux |
| Pressure (mb) | Temperature (°C) | Humidity (%) | Light (lux) | Date/Time |
|---|---|---|---|---|
| 1016.1 | -0.1 | 98.1 | 0.0 | 2025-03-24 03:14:40 |
| 1016.0 | -0.0 | 98.1 | 0.0 | 2025-03-24 03:28:45 |
| 1016.0 | 0.1 | 98.3 | 0.0 | 2025-03-24 03:42:50 |
| 1015.9 | 0.3 | 99.4 | 0.0 | 2025-03-24 03:56:55 |
| 1015.8 | 0.2 | 99.5 | 0.0 | 2025-03-24 04:10:59 |
| 1015.8 | 0.1 | 99.7 | 0.0 | 2025-03-24 04:25:03 |
| 1015.7 | -0.0 | 100.0 | 0.0 | 2025-03-24 04:39:08 |
| 1015.6 | 0.0 | 100.0 | 0.0 | 2025-03-24 04:53:12 |
| 1015.6 | -0.2 | 100.0 | 0.0 | 2025-03-24 05:07:15 |
| 1015.5 | -0.2 | 100.0 | 0.0 | 2025-03-24 05:21:23 |
| 1015.5 | 0.2 | 100.0 | 3.1 | 2025-03-24 05:35:27 |
| 1015.7 | 0.5 | 100.0 | 27.5 | 2025-03-24 05:49:33 |
| 1015.7 | 0.4 | 100.0 | 159.1 | 2025-03-24 06:03:37 |
| 1015.6 | 0.3 | 100.0 | 489.6 | 2025-03-24 06:17:44 |
| 1015.5 | 0.5 | 100.0 | 1273.0 | 2025-03-24 06:31:48 |
| 1015.7 | 0.7 | 100.0 | 2545.9 | 2025-03-24 06:45:53 |
| 1015.8 | 1.2 | 100.0 | 3525.1 | 2025-03-24 06:59:58 |
| 1015.8 | 1.8 | 100.0 | 3916.8 | 2025-03-24 07:14:08 |
| 1015.7 | 2.2 | 100.0 | 3916.8 | 2025-03-24 07:28:14 |
| 1015.7 | 2.8 | 100.0 | 4700.2 | 2025-03-24 07:42:20 |
| 1015.6 | 2.9 | 100.0 | 4308.5 | 2025-03-24 07:56:25 |
| 1015.6 | 3.1 | 100.0 | 3525.1 | 2025-03-24 08:10:30 |
| 1015.6 | 3.2 | 100.0 | 4308.5 | 2025-03-24 08:24:36 |
| 1015.6 | 3.5 | 100.0 | 4700.2 | 2025-03-24 08:38:42 |
| 1015.6 | 4.0 | 100.0 | 5875.2 | 2025-03-24 08:52:51 |
| 1015.6 | 4.7 | 100.0 | 7833.6 | 2025-03-24 09:06:57 |
| 1015.2 | 6.6 | 95.5 | 9400.3 | 2025-03-24 09:21:07 |
| 1015.0 | 7.6 | 92.9 | 9400.3 | 2025-03-24 09:35:16 |
| 1015.0 | 8.0 | 90.1 | 11750.4 | 2025-03-24 09:49:24 |
| 1014.8 | 8.7 | 88.3 | 10183.7 | 2025-03-24 10:03:31 |
| 1014.7 | 9.4 | 85.5 | 11750.4 | 2025-03-24 10:17:39 |
| 1014.3 | 10.0 | 83.6 | 12533.8 | 2025-03-24 10:31:46 |
| 1014.5 | 10.1 | 80.8 | 10183.7 | 2025-03-24 10:45:52 |
| 1014.1 | 11.1 | 77.8 | 10183.7 | 2025-03-24 11:00:00 |
| 1014.0 | 11.7 | 76.2 | 12533.8 | 2025-03-24 11:14:08 |
| 1013.9 | 11.1 | 74.7 | 12533.8 | 2025-03-24 11:28:13 |
| 1013.7 | 12.4 | 71.4 | 14100.5 | 2025-03-24 11:42:22 |
| 1013.7 | 12.4 | 68.7 | 17233.9 | 2025-03-24 11:56:29 |
| 1013.7 | 14.1 | 68.1 | 18800.6 | 2025-03-24 12:10:37 |
| 1013.7 | 13.0 | 67.0 | 11750.4 | 2025-03-24 12:24:41 |
| 1013.5 | 12.6 | 69.2 | 14100.5 | 2025-03-24 12:38:47 |
| 1013.6 | 12.3 | 69.2 | 12533.8 | 2025-03-24 12:52:52 |
| 1013.7 | 11.4 | 71.2 | 12533.8 | 2025-03-24 13:06:56 |
| 1013.5 | 11.3 | 72.5 | 14100.5 | 2025-03-24 13:21:02 |
| 1013.7 | 12.4 | 69.7 | 12533.8 | 2025-03-24 13:35:11 |
| 1013.7 | 11.6 | 71.7 | 12533.8 | 2025-03-24 13:49:15 |
| 1013.4 | 11.2 | 73.4 | 14100.5 | 2025-03-24 14:03:21 |
| 1013.2 | 12.6 | 70.8 | 20367.4 | 2025-03-24 14:17:33 |
| 1012.9 | 12.9 | 69.2 | 15667.2 | 2025-03-24 14:31:41 |
| 1013.3 | 12.1 | 71.2 | 14100.5 | 2025-03-24 14:45:44 |
| 1013.2 | 11.9 | 71.4 | 15667.2 | 2025-03-24 14:59:52 |
| 1013.2 | 12.3 | 71.5 | 10967.0 | 2025-03-24 15:14:02 |
| 1013.0 | 11.9 | 72.6 | 9400.3 | 2025-03-24 15:28:10 |
| 1012.7 | 11.4 | 73.6 | 6266.9 | 2025-03-24 15:42:14 |
| 1012.8 | 11.0 | 75.1 | 6266.9 | 2025-03-24 15:56:18 |
| 1012.5 | 10.9 | 76.1 | 5091.8 | 2025-03-24 16:10:24 |
| 1012.2 | 10.5 | 77.0 | 4308.5 | 2025-03-24 16:24:29 |
| 1012.7 | 10.4 | 77.9 | 4308.5 | 2025-03-24 16:38:34 |
| 1012.3 | 10.3 | 78.8 | 2937.6 | 2025-03-24 16:52:39 |
| 1012.1 | 10.1 | 80.0 | 1762.6 | 2025-03-24 17:06:47 |
| 1012.5 | 10.1 | 80.5 | 1273.0 | 2025-03-24 17:20:52 |
| 1012.7 | 10.0 | 80.9 | 783.4 | 2025-03-24 17:34:58 |
| 1012.4 | 10.0 | 81.6 | 489.6 | 2025-03-24 17:49:03 |
| 1012.1 | 9.8 | 83.9 | 881.3 | 2025-03-24 18:03:11 |
| 1012.2 | 9.6 | 84.8 | 538.6 | 2025-03-24 18:17:17 |
| 1012.2 | 9.6 | 85.3 | 220.3 | 2025-03-24 18:31:23 |
| 1012.3 | 9.7 | 85.3 | 85.7 | 2025-03-24 18:45:29 |
| 1012.5 | 9.9 | 85.2 | 15.3 | 2025-03-24 18:59:34 |
| 1012.8 | 9.9 | 85.3 | 1.5 | 2025-03-24 19:13:43 |
| 1012.9 | 9.9 | 85.1 | 0.0 | 2025-03-24 19:27:48 |
| 1012.9 | 9.9 | 85.8 | 0.0 | 2025-03-24 19:41:57 |
| 1012.8 | 9.9 | 86.6 | 0.0 | 2025-03-24 19:56:03 |
| 1013.1 | 9.9 | 86.5 | 0.0 | 2025-03-24 20:10:09 |
| 1013.1 | 9.9 | 87.5 | 0.0 | 2025-03-24 20:24:18 |
| 1013.2 | 9.9 | 87.5 | 0.0 | 2025-03-24 20:38:24 |
| 1013.3 | 9.6 | 87.7 | 0.0 | 2025-03-24 20:52:31 |
| 1013.5 | 9.6 | 88.7 | 0.0 | 2025-03-24 21:06:37 |
| 1013.4 | 9.7 | 89.5 | 0.0 | 2025-03-24 21:20:45 |
| 1013.4 | 9.6 | 89.5 | 0.0 | 2025-03-24 21:34:51 |
| 1013.4 | 9.4 | 90.3 | 0.0 | 2025-03-24 21:48:56 |
| 1013.2 | 9.4 | 90.8 | 0.0 | 2025-03-24 22:03:02 |
| 1013.4 | 9.4 | 90.6 | 0.0 | 2025-03-24 22:17:08 |
| 1013.4 | 9.3 | 92.4 | 0.0 | 2025-03-24 22:31:13 |
| 1013.4 | 9.2 | 93.7 | 0.0 | 2025-03-24 22:45:18 |
| 1013.2 | 9.3 | 94.0 | 0.0 | 2025-03-24 22:59:25 |
| 1013.3 | 9.1 | 94.0 | 0.0 | 2025-03-24 23:13:30 |
| 1013.5 | 9.0 | 95.0 | 0.0 | 2025-03-24 23:27:36 |
| 1013.6 | 8.9 | 95.4 | 0.0 | 2025-03-24 23:41:41 |
| 1013.8 | 8.8 | 96.4 | 0.0 | 2025-03-24 23:55:46 |
| 1013.9 | 9.1 | 98.8 | 0.0 | 2025-03-25 00:09:53 |
| 1013.9 | 8.6 | 98.5 | 0.0 | 2025-03-25 00:23:58 |
| 1014.0 | 8.4 | 100.0 | 0.0 | 2025-03-25 00:38:02 |
| 1014.1 | 8.4 | 100.0 | 0.0 | 2025-03-25 00:52:08 |
| 1014.2 | 8.1 | 100.0 | 0.0 | 2025-03-25 01:06:12 |
| 1014.2 | 8.2 | 100.0 | 0.0 | 2025-03-25 01:20:18 |
| 1014.2 | 8.6 | 100.0 | 0.0 | 2025-03-25 01:34:25 |
| 1014.2 | 9.1 | 100.0 | 0.0 | 2025-03-25 01:48:34 |
| 1014.3 | 9.4 | 100.0 | 0.0 | 2025-03-25 02:02:39 |
| 1014.6 | 9.6 | 100.0 | 0.0 | 2025-03-25 02:16:41 |
| 1014.8 | 9.4 | 100.0 | 0.0 | 2025-03-25 02:30:50 |
| 1014.9 | 8.8 | 95.7 | 0.0 | 2025-03-25 02:44:55 |
| 1015.1 | 8.6 | 93.3 | 0.0 | 2025-03-25 02:58:58 |