Is there an inherent precision to this system, or is that something that can be adjusted? I’m considering this for an application that would measure the weight of pills, and distinguish between different types of pills, so it would need to have a precision in the +/-10mg range.
Gday Mr Daouas My Employer has given me a project to make a very budget load cell display using four load cells under a tank. Is it possible to just parrallel all four letting them produce their own average and using that analogue input into the shield as I have seen done into other “digitisers/amplifiers”, then stacking a display(yes bending pins and re assigning as per above blog). Thankyou in advance for any consideration.
@Jeremiah The Strain Gauge Shield won’t be appropriate for this type of precise measurements. FYI, the smallest cell weight capacity we offer, which is 100g Micro Load Cell, has a +/-50mg error rating.
@ Paul G You can probably use 4 load cells stacking two Strain Gauge Shields using the workaround mentioned above (bend the two pin headers (A0 and A1) on one of the shields and wire them to a different analog input on the Arduino). Then, you stack the display shield. Please note that this has not been tested. You’ll probably have to appropriately calibrate the 4 load cells in your Arduino code to obtain meaningful readings.
Hi, I’m thinking of using this set up and was wondering how sensitive is the 5kg micro load sensor? I’m working on a uni project in which I need to measure the amount of liquid in a cup, building the sensor into the base. how accurate is it?
Thankyou Sir
Hi, great info, I’m doing a test stand for small propellers and using 4 load cells, seems I’ll need the 0.78kg’s using one for each leg of an 16" X-frame to get the strain, a pair for x-axis & y-axis and all 4 to get total lift or down-thrust and polar balance.
This shield looks perfect so appreciate advice on circuitry, IC’s to process the signals for the goal to automatically balance them by sanding actuators from testing data.
A newbie but ok on easy circuits & soldering & good at code. So far I like the Sparkfun redboard for this, found an rpm sensor using the motor signal, assume a watt-meter ability on the board or controller for a DJI Phntm 2 motor, my prop replaces those so using it, found a schematic.
There are two modes, testing is much higher rpm to limits, fails to a positioning-sand cycle, the output curves used to pair & create quad sets & on all labels along with the final weight.
Final step is the x-frame is mounted on shafts to allow dead-lift testing to flight, energy the metric vs time & 3-axis acceleration.
-tom
Hello, I am using Arduino Mega 2560 board - can i use this shield with it? (I am just stating with Arduino).
@Orlin Yes the Arduino Mega 2560 is compatible with the Strain Gauge / Load Cell / Wheatstone Amplifier Shield
Hello, I have two questions.
1 - I already have my load cell shield and it outputs 3.2 volts for excitation for both the strains, can this output be modified?
2 - I have a load cell which gets 12 volts for excitation from its original equipment. Could I supply this 12 VC volts to the cell and get the signal with your load cell shield?
Many thanks in advance.
@Joaquin: 1) No, the output voltage cannot be changed.
2) This shield already provide its own excitation and adding 12 V DC to it will most likely damage the circuit.
This device is targeted at low nominal voltage load cells.
which amplifier can be used to connect loadcell and the arduino board directly?and alsowhich amplifier can be used to connect solenoid valve and the arduino board directly?
can strain gauge load cell can be directly connected to arduino board?
can i use relay instead of amplifier for inetrfacing solenoidvalve to thr arduino? if it is possible please say what type of relay i have to used?
@nishanthi: Yes, it can. But, the results will most likely not be very useful. The changes in voltage from the load cell will most likely not be detectable with an Arduino’s ADC pins. The Arduino ADC has a 10-bit resolution, so over a range of 5-0 V DC, it would have a theoretical sensitivity of ~4.9 mV. Most load cells that we cell have an output of ~1 mv/V, or about ~3.3 mV @ 3.3 V DC (the excitation voltage of the shield). This means the Arduino would probably not even be able to detect at all the signal in a best case scenario. We strongly recommend using a proper amplifier to connect your load cell, such as this one (one channel) and this one (two channels).
@nishanthi: Concerning a solenoid valve, it is an inductive load. We recommend that you use a relay, such as these ones. For an Arduino platform, you can check these out specifically.
@shan: Concerning a solenoid valve, it is an inductive load. We recommend that you use a relay, such as these ones. For an Arduino platform, you can check these out specifically. The relay type will mostly depend on what voltage and current your solenoid valve requires.
- actually i have 24V solenoid valve. i have to interface this valve to arduino board. so you said you can use 4 state relay 12v. my question is 12v relay is sufficient to produce high current to drive this valve?? if it is not possible can i use two 12v relay instead of 24v relay if it is not 2) 4 state relay can be used for drive solenoid valve which is interfaced with the arduino mega 2560??? sir actually we have 24V solenoid valve and this is interfaced to the arduino. for this you already said you can use relay. so shall we can use two 12v relay ???
@shan: Such a question is beyond the blog post comments. We recommend that you instead post about your project on our forum here.