Sarah Al-Mutlaq

Member Since: May 14, 2014

Country: United States

A look into our awesome solar array and what it's doing for SparkFun.

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A fun holiday project to try for anyone looking to catch Santa on Christmas!

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Show us what you can make out of reused parts!

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Adding a Timed Button to a Project

July 29, 2015

This tutorial will walk you through making a timed power controller for interactive projects. You will learn how to add an on button that will provide power to your project for an amount of time and then turn off again.

Soil Moisture Sensor Hookup Guide

July 23, 2015

A quick hookup guide and project to get you started with the Soil Moisture Sensor from SparkFun.

Load Cell Amplifier HX711 Breakout Hookup Guide

June 11, 2015

A hookup guide for the HX711 load cell amplifier breakout board

Getting Started with Load Cells

June 11, 2015

A tutorial defining what a load cell is and how to use one.

Origami Paper Circuits

May 26, 2015

A quick tutorial to get you started in the world of light up origami flowers.

RedBoard Santa Trap

December 25, 2014

A fun holiday project to try for anyone looking to catch Santa on Christmas!

Soil moisture-sensing by hacking a solar light

June 19, 2014

How to take a solar powered pathway light from a hardware store and make it into a crude soil moisture sensor.
  • I would connect them next to each other, and then in the other two places put resistors. This will also act like a wheatstone bridge but just with two variable resistors instead of 4. Then hook that up to the amplifier board and test it with the code. It’s going to be different, like probably slightly less accurate than using 4, but it should still work well with all the code. Hope that helps you!

  • Sure thing!

  • On the back, there is two little solder pads in brackets, with “rate” written under it, to “open the jumper” take a scalpel and just separate the connection which is part of the printed board. To “close the jumper” again just bridge the pads with solder. It’s not very clear on the schematic, sorry. I hope that helps!

  • I’ve only done a little bit of PCB design, so am a little less comfortable with that. You could try our customer service, but I’m not sure if they would be able to help with that specifically, but you could try and see. Sorry I can’t be of more help.

  • Nope, totally fine, they were important questions. I’m glad I could help you out with your project!

  • The yellow pin is for if you had a protective “ground” wire on your load cell, it is not essential and not overly common, so if you don’t have one don’t sweat it. The B- and B+ are pulled directly from the chip itself. They are used like the A- and A+ on the chip. I have never used the B- and B+ so they are just extras.

  • Size is a big difference yes, but also the straight bar is made out of some additional materials which have slightly different qualities, like how it is effected by temp, and things like that. Since it is made out of both aluminum-alloy or alloy steel (the wide is just aluminum-alloy) it can also technically hold a bit more weight. I don’t think for your purposes it will matter which one you choose, unless you have a space issue.

  • If you can try to keep it at the same temp for more accurate readings, the load cell has compensated for the temp changes from -10 degrees C to 40 degrees C, so if you are within that range you should be fine to ignore temp. The load cells operating range is from -10 degrees C to 55 degrees C though, so if you happen to be operating between the temp of 40 degrees C and 55 degrees C the amount your readings might be off is about 0.05% per 10 degrees C, so still pretty small, but if that effects what you are looking for you might want to compensate for it with a temp sensor and some code adjustment.

  • On our breakout board it is set default closed, shorting the rate pin to ground, which puts it at a data rate of 10 SPS. So yes if you have your own, short the rate pin to ground to get the 10 SPS rate. The case you would want it open for 80 SPS is if you want crazy fast reading because things are happening faster than the 10 can see. But this also means that you will get additional noise in the readings if you are just looking at longer term changes. I hope that helps.

  • Interesting, I think I am picturing this right. The deflection is going to be very very very small, like not noticeable to the human eye, do you need more exact info than that? If so you will have to measure it yourself with some test weights, since the exact amount it deflects will depend on your specific cell and the temperature and some other various factors.

IoT CloudCloud

Sarah Al-Mutlaq 7 items

Parts used in the third Fellowship of the Things episode:...

Soil moisture sensor parts

Sarah Al-Mutlaq 6 items

The soil moisture sensor is made from parts in the Sparkfun...

Adding a timed power button

Sarah Al-Mutlaq 8 items

These are the parts you will need for adding a timed power...

Soil moisture sensor add on

Sarah Al-Mutlaq 9 items

List of parts I used to make my self watering system that...

Light up origami flowers

Sarah Al-Mutlaq 5 items

All the electronic parts needed to get you started on making...

Soil moisture sensor parts kits

Sarah Al-Mutlaq 2 items

The soil moisture sensor is made from parts in the Sparkfun...