MSGID: <10fk8la$26m94$1@dont-email.me> 09732dc4   
   REPLY: <10fk4vk$25alv$1@dont-email.me> f1790eca   
   PID: PyGate 1.5   
   TID: PyGate/Linux 1.5   
   CHRS: CP437 2   
   TZUTC: 0000   
   REPLYADDR daniel@me.invalid   
   REPLYTO 3:633/10 UUCP   
   Subject: Re: OIL level sensor (was ODD DNS behaviour on Pi ZERO W with   
   Bullseye OS)   
      
   On 19/11/2025 10:08, The Natural Philosopher wrote:   
   > Oh. I designed a board with   
   >    
   > - a Pi Pico W.   
   > - a three pin temperature sensor ( TMP36) to monitor outside temperature   
   > - an ultrasonic transmitter/receiver ( HCRS04) on it   
   > - a nano power timer that (Was a sparkfun nano power switchÿ TPL5110    
   > until I blew it up and replaced it with a sub-boardÿ with an Adafruit    
   > TPL5110 Low Power Timer ) wakes up every 2 hours, tries to make contact    
   > with the wifi, sends a short message to the server, and then commits    
   > suicide and shuts the timer down again.   
      
   OK, thanks. What sort of oil tank do you have and how do you fit the    
   sensor to it?   
      
   I'm part-way through designing something similar myself, but using an    
   ESP8266 to control the sensor and talking mqtt to a Pi (happens to be a    
   Pi3B, because I have one always-on for other things but I could have    
   used a ZeroW). It's really at Proof-of-Concept stage at present.   
      
   I have a 3V-compatible HCSR04 to play with, but was wondering whether an    
   ir laser ToF device might be better. Those ultrasonic sensors are a bit    
   chunky ... (I'm told there is no chance of the laser in,say, a VL53L1X    
   igniting heating oil vapour!)   
      
   I haven't yet put either anywhere near the oil tank, yet. I'm using    
   readings from a BME280 to test the logic.   
      
   I have a "Cheap Yellow Display" (ESP32 with LCD) that acts as a mqtt    
   client and display panel ... it can record data (but doesn't yet) but    
   I'll probably want something more sophisticated later ... as I say, it's    
   all PoC at present.   
      
   --    
   Cheers,   
     Daniel.   
      
   --- PyGate Linux v1.5   
    * Origin: Dragon's Lair, PyGate NNTP<>Fido Gate (3:633/10)   
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