After buying a HC-SR04 from Amazon, I could not get it to work out of the box. Not wanting to concede I had a DOA sensor on my hands, I searched for a simple example setup. After spending far too long on this than I felt I needed to, I decided to make this instructable to help other emerging tinkerers get their project off the ground. I admit this example is more than bare-bones in that it has LEDs, but this lets me test it without needing a PC to show distance and check the accuracy of the sensor. Step 1: Parts List. I've purchased the sonic sensor along with a 4 digit 7-segment LED, and am planning to use this idea as a gauge for my rainwater tank.

Knowing the depth of the water surface below the top of the tank, I can work out the remaining capacity and display it on the LED either as the number of litres left, or more likely I'll just display it as a percentage. I think 65% is more immediately meaningful than knowing I have 1137 litres Still waiting for my gear to arrive, so am intrigued to know the accuracy of this device, but will probably dumb it down to 5% increments anyway for the display.

Thanks for providing a good grounding to understand the connection and operation of the unit. Thanks for the idea - but access into the rainwater tank is very limited via a single 30cm diameter hole in the top, and I don’t really want to start drilling holes and have to seal them (a disaster just waiting to happen!!), but the good news is that I have been able to build and test my unit - at least on breadboard (haven’t had time to mount it in a box yet), and all works to my satisfaction. The next step is to make all the connections permanent on my pro-mini, and drill the correct size holes in the box for the sensors to poke through.

Btw - very impressed with the accuracy of the unit considering it was a cheap Chinese clone from eBay - it was good to within 1-2cms at 4 metres, and. Hi there, I'm doing something similar to this for a school project.

Explore My Mum Drives a UFO's board 'wearables projects - Adafruit Gemma or Trinket' on Pinterest. See more ideas about Electronics, Cable and Diy electronics. Start your electronics and coding projects with the user friendly, Arduino based open-source Adafruit Trinket Microcontroller - 5 V. With the supplied header pins yo.

I have three SR04s (and will eventually have three LEDs). Hayden Supervac 3600 Manual Transfer here. I've hooked up one LED, to turn on when something is within a certain range of sensor 0. I've debugged the code and the LED turns on when it should, but it's REALLY dim. You wouldn't even notice if you weren't looking for it.

That's without even having a resistor in the LED circuit (which I know isn't recommended, but with a resistor, the LED probably wouldn't even turn on). I'm assuming the amount of current is the issue - is this due to having so many sensors? Do you have any suggestions for increasing the current in the LED?

Iso Container Corner Castings For Boats. •Start your electronics and coding projects with the user friendly, Arduino based open-source Adafruit Pro Trinket Microcontroller - 3 V •With the supplied header pins you can snap the Adafruit Pro Trinket into any breadboard •Power your Adafruit Pro Trinket with just a USB cable, or solder on a 2-pin JST connector for a LiPo battery •Even on such a tiny board they’ve managed to squeeze in 18 Digital I/O Pins, 6 of which are PWM and one Analogue in •Using Arduino has never been easier, with thousands of tips, tricks and guides readily available online. Reasons to pick the Adafruit Pro Trinket The Adafruit Pro Trinket is a tiny open-source Arduino board. Start any electronics or coding projects readily available online in the huge Maker community, or design a project yourself. With any tiny project, you’ll need a tiny board, none will fit better than the Adafruit Pro Trinket, being only 18 mm wide it can be tucked into the tiniest of places.

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