×

SparkFun Electronics will be closed in observance of memorial day on Monday, May 29th. We will resume normal business hours on Tuesday, May 30th. Any orders placed after 2pm Mountain Time on Friday, May 26th will process and ship out on Tuesday, May 30th.

Member #517619

Member Since: February 5, 2014

Country: United States

  • The datasheet states that the RHT03 can be used with 3.3 to 6V. Is anyone successful in using RHT03 sensors with 3.3V power? I have a breadboard prototype with multiple RHT03 sensors and an Arduino Pro Mini powered via an FTDI Basic board. The sketch is a modification of the DHT library from Adafruit. When using a 5V/16Mhz Arduino Pro Mini the sketch outputs apparently valid humidity and temperature values for all sensors. However, after replacing the Pro Mini with the 3.3V/8MHz version (Vcc = 3.26V actual) the software reports values of 0.0 for humidity and temperature for all sensors. I have tried: 1) using 1K, 10K or no pullup resistors, 2) 100nF caps across sensor Vcc-GND, or none, 3) connecting both sensor pins 3 & 4 to GND. With any of these changes the reported values remain at 0.0. Maybe the signal timing needs to be tweaked for 3.3V??

  • Thanks for your helpful pointers Mike. :-) The example sketch works now.

  • I am trying to compile the example software, but getting the error message ‘SFE_TSL2561_example:53: error: “SFE_TSL2561” does not name a type’. The ‘SFE_TSL2561 light;’ statement is highlighted near the top of the sketch. The downloaded folder was installed in ‘Libraries’ (on a Mac), and the .h and .cpp files are present. I don’t see how the SFE_TSL2561 class is not recognized by the compiler. Any suggestions for how to fix?

No public wish lists :(