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Recent content by DNA Robotics

  1. DNA Robotics

    [SOLVED] PIC and HD44780 display "ghost" characters

    You just need to cover up 1's place digit that didn't get over written. Write the number and a space or 2 spaces if you ever have a 3 digit number. Unless you really want the % sign in the same column all the time, I would write the number and a space % sign and a space (or 2).
  2. DNA Robotics

    When to use GPS Warm Start and COLD Start

    Just out of curiosity, I tested this GPS Module. I took a few sets of data with a Stationary GPS sampling once per second then plotted the 3 least significant digits in Excel.
  3. DNA Robotics

    When to use GPS Warm Start and COLD Start

    I am using a different one. GPS Module with Ceramic Antenna for DIY Handheld Positioning System for $7.86 https://www.dx.com/p/open-smart-gps-serial-gps-module-for-arduino-apm2-5-flight-control-480918#.WiDKElWnH4Y I don't have a cold / hot start option but it does get good data faster if it is...
  4. DNA Robotics

    Interface Wireless pressure sensor with PIC controller

    That is more like it with 203 max PSI. Typically measuring pressure inside a pipe, you have a sensor in a pipe fitting that goes into the pipe. Wires from that sensor go to the gauge or transmitter in your case. I don't see any external sensor on that unit. It looks like it measures ambient...
  5. DNA Robotics

    Interface Wireless pressure sensor with PIC controller

    Their max 200 kPa is less than 30 PSI. Is that what you want?
  6. DNA Robotics

    How to take inputs faster using Raspberry Pi

    "I could only get sampling speeds of around 10000 samples/sec." From https://www.nxp.com/docs/en/data-sheet/PCF8591.pdf The maximum A/D conversion rate is given by the actual speed of the I2C-bus. But in another place it says Maximum DAC conversion frequency is 11.1 kHz
  7. DNA Robotics

    Underwater electrode

    In the marine environment they use silicon bronze or stainless steel for underwater hardware because they don't erode easily with electrolysis. The best stainless for propeller shafts is Aquamet 22. https://www.aquamet.com/aquamet22.nxg If you can find an old propeller shaft at a marina that is...
  8. DNA Robotics

    is there a 3 Way Relay

    What are you trying to do? Maybe we can do it another way.
  9. DNA Robotics

    Motor speed detect sensor

    https://www.walmart.com/ip/Digital-Laser-Photo-Tachometer-Non-Contact-RPM-Tach-Speed-Gauge-Engine/351242665?wmlspartner=wlpa&selectedSellerId=5957&adid=22222222227107986276&wl0=&wl1=g&wl2=c&wl3=233386681898&wl4=pla-386008971581&wl5=9012001&wl6=&wl7=&wl8=&wl9=pla&wl10=114220812&wl11=online&wl12=35...
  10. DNA Robotics

    K type thermocouple Amplifier needed

    I don.t know if you can interface to it. High Temperature Thermostat -30 to 999Deg. Sale: $9.95 https://www.mpja.com/High-Temperature-Thermostat-30-to-999Deg/productinfo/34687+MP
  11. DNA Robotics

    latitude and longitude

    I am using this GPS Module with Ceramic Antenna for DIY Handheld Positioning System for $7.86 https://www.dx.com/p/open-smart-gps-serial-gps-module-for-arduino-apm2-5-flight-control-480918#.WiDKElWnH4Y This is the NEMA ascii sentence that it works with...
  12. DNA Robotics

    Servo-control for generator start

    I couldn't make your sketch work so I started over. It does what you asked for but I think it will open the choke too soon. You can tweak it to suit your needs. /* Thank you Leifjoha for this simple frequency counter that he left in the comments here...
  13. DNA Robotics

    Servo-control for generator start

    val = analogRead (FREQ) ; Doesn't look right. Try val = FREQ ; - - - Updated - - - myservo.attach (10); // connects the servo to pin 10 digitalWrite (5, FREQ) ; How do you Write a float to 1 pin? What are you doing with pin5? - - - Updated - - - float FREQ = 0 ; pinMode (FREQ...
  14. DNA Robotics

    Industrial "putty" needed to stick wires to heatsink

    Permatex® High-Temp Red RTV Silicone Gasket Maker is not a putty but is very viscus and would hold small wires in place. It skins over in 10 minutes. Temperature range -65ºF to 650ºF (-54°C to 343°C)...
  15. DNA Robotics

    Looking for stackable header connectors

    The pins aren't very thick but they work Arduino I/O Interface Headers $0.30 10 Pin headers for Arduino, UNO, PRO, MEGA shield boards. These long pin headers are the correct height to provide stacking and clearance for most shields. H: 19mm WT: .002...

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