SparkFun Electronics will be closed on November 26, 2020 and November 27, 2020 for the Thanksgiving holiday. We will begin normal operations at 9:00 AM Mountain Time on November 30, 2020.


Please see all COVID-19 updates here as some shipments may be delayed due to CDC safety and staffing guidelines. If you have an order or shipping question please refer to our Customer Support page. For technical questions please check out our Forums. Thank you for your continued support.

Member #23890

Member Since: September 4, 2007

Country: United States

  • Found some strain gauge info on National Instruments site. http://zone.ni.com/devzone/cda/tut/p/id/4172

    According to the page, a load cell in any bridge configuration would already have temperature compensation built in. This one must either be a quarter or half bridge since it has 3 wires. If its quarter bridge then it has a active element and a temp compensation resistor. If half bridge then 2 active elements, giving temp compensation simply because there together in one spot, being affecting by the temperature equally.

    All thats needed is to complete the bridge for your amp. So I don't see why you couldn't use two resistors to do so. Or better yet use the second load cell with reverse polarity to give you a full bridge. twice the accuracy, twice the load limit.(reverse polarity so they add and not cancel out)

    I'm still experimenting with mine. Also found a cheaper solution to the AD620, the AD8223 which is designed for scales I think. and the AD7799, amp and hi resolution ADC with spi interface if your making a scale. might be worth looking into.

  • They didn't crash? I couldn't even get the page to load 10 mins after it started. I just gave up. I spent an hr last yr hitting refresh to no avail.

No public wish lists :(