Differences

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--- dylos_dc1700 [2024/11/19 16:12] – river
+++ dylos_dc1700 [2026/08/25 06:14] (current) – river
@@ Line 7: / Line 7: @@
 DC power input 12V centre positive. With added ESP8266, draws about 300mA peak on start, then 200mA steady. The board gets pretty warm for some reason.
-Clock battery: CR1220s 3V.
+Clock battery: CR1220s 3V. Not necessary.
-====== Modifications ======
-I have modified the one I had. When I got it, it was already a bit broken. Fan disconnected and no main battery. I replaced the fan. I added an ESP8266, which is connected to the UART output of the PIC to read the measurements. I didn't connect a line the other way. I expect it will need to be calibrated for the new fan and changed wiring / battery removal etc. as it will have affected the airflow.
-The external serial port is not connected to anything.
 ===== Serial Connection =====
@@ Line 26: / Line 20: @@
 would mean the average concentration over the past minute
 was 67,500 particles per cubic foot." (manual)
+===== Modifications =====
+I have modified the one I have. When I got it, it was already a bit broken. Fan disconnected and no main battery. I replaced the fan. I added an ESP8266, which is connected to the UART output of the PIC to read the measurements. I didn't connect a line the other way. I expect it will need to be calibrated for the new fan and changed wiring / battery removal etc. as it will have affected the airflow.
+The external serial port is not connected to anything.
+===== MQTT =====
+Readings output on MQTT are divided by 100, as obtained from sensor, so in hectocounts / m^3.
+This is now displayed correctly on grafana, which multiplies to units in the query.
+[[https://grafana.ehlab.uk/d/lNTfyoJ7z/environment-sensors?orgId=1&from=now-24h&to=now&refresh=1m]]
+===== Log =====
+  * 25 August 2026 - Moved uart connection to D7 on the ESP board. Cleaned, dusted. Improved program to use hardware UART.