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Member #1668110

Member Since: April 1, 2021

Country: United States

  • Do these sensors need their own Sparkfun library to work properly? I am tying to use 2 of theses sensors with Mycodo to control VPD in a hydroponics greenhouse, but the air pressure and VPD readings from the sensors are extremely high. Mycodo only has the Adafruit and RPi.bme280--0.2.3 libraries available for the BME280 sensor. Air pressure is reading around 92130724.87 kPa when it should read about 100 kPa for my location and altitude. VPD is reading 1223193.407 kPa when it should be around 1.50 kPa for the temp and humidity I maintain in the greenhouse. Are these sensors not compatible with the Adafruit and RPi libraries?

  • Can this "midpoint" be directly connected to the Raspberry Pi and used as a t-connector? What I need is to use it as a "T-splitter" so I can send 2 cables with sensors in 2 different directions away from the Pi, and then use the QwiicBus EndPoints at the ends of both cables. Is it possible to use this board in this manner? Thank you.

  • I need to know if the SparkFun Logic Level Converter - Single Supply (PRT-14765) can be used to directly control the speed of a PWM computer fan.

    I have a 12V 4-wire PWM computer fan. (4 wires = 12V+, 12V-, 5V PWM signal IN, 5V RPM pulse signal OUT) I want to control the speed of the fan via it's 5V PWM signal input line. I am powering the fan with a 12V power supply that is separate and isolated from my Raspberry Pi. I would like to use the R-Pis HARDWARE PWM pin (not software PWM) to send PWM signals directly to the fan through the SparkFun Logic Level Converter - Single Supply since the Pi only outputs 3.3V, and the fan needs a 5V PWM input signal.

    Is this possible to do ONLY using the SparkFun Logic Level Converter - Single Supply and NO OTHER extra circuit components? If so, do I need to connect a ground on the fan side or can I just use the single PWM input wire connected to the output side of the SparkFun Logic Level Converter - Single Supply? If I need to connect a ground from on the 5V side of the SparkFun Logic Level Converter - Single Supply, where would I ground it to? I wouldn't want to ground it to the 12V ground of the fan's power supply would I? Would I need to put resistors across the ground connection to the 5V ground of the SparkFun Logic Level Converter - Single Supply to make sure I'm not frying something? I could really use some advise on how to set this up... I thought this would be simple but it's turning into a nightmare just to control the speed of a fan that is already designed to be controlled by PWM signal input :-(

    Thank you.

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