Hi, I am interested in purchasing the SEN-14727 miniature load cell to measure weight accurate to 1g with a 5V source. I need it to output 2 analogue signals which can be amplified by an ADS1115 ADC, to then be used with a Raspberry Pi to measure weight using I2C with a GPIO interrupt. I wanted to ask if this load cell is a suitable choice for this application?
Thank you for any advice you can offer.
BruGenie
Yes, I think so. That load cell could be used with 5 volt excitation and, assuming adequate mounting and calibration, could be expected to maintain a 1 gram tolerance; it’s 1% of capacity.
However, the load cell does not have two signals, do you mean the pair of wires?
In any case, I highly recommend buying a purpose built scale chip & board instead of trying to use a general purpose A/D like proposed. Here’s a flashy fun red one, totally found at random.
Thanks for your help. I want to use a strain gage to measuring a changing force and record it on the same time base as another sensor, and possibly a 3rd sensor. Is here a Wheatstone Bridge on the NAU7802?
I want to record at at least 1 kHz the changing force on a load cell,
time stamp it, record and monitor it on a PC via USB.
I could settle for recording onto an SD, but I’d rather have it continually viewed on a PC graph.
I noticed that Phidgets has a modular set of components for this kind of thing. They’re in Canada. The customs fees are extreme and delays can be many weeks. I’d rather buy from you, because I’m in Colorado and you are the kind of business I like to see.
NAU7802 won’t do anything close to 1000/second. It’s intended as a scale front end, for weighing, and mass simply doesn’t change very quickly or unpredictably.
Your force measurement application can potentially use the same sensors, the load cells, but the electronics and logging will really need to clip along to keep up with that rate and correlated with time & other sensor inputs. Here’s a thought experiment: couldn’t you use a soundcard input & audio software to capture & analyze really fast force transients?
Another easy and obvious route is the HX711, which does all the hard work (including supplying regulated excitation voltage) and gives much higher resolution than the ADS1115.
I want to record at at least 1 kHz the changing force on a load cell,
The ADS1115 is limited to 860 SPS maximum.