Hello, I am trying to build a high precision scale (0.01 gr) with Arduino. At the same time, I would like to install a pressure transmitter (M6) connected to a differnet or the same micro via BLE.
I don´t know where to start and I would really appreciate some guidance here! Thanks
Hello @RaulRobotShop and welcome to the RobotShop community,
You can build a high precision scale with this load cell amplifier:
Here’s some useful information:
https://learn.sparkfun.com/tutorials/load-cell-amplifier-hx711-breakout-hookup-guide
https://learn.sparkfun.com/tutorials/getting-started-with-load-cells
Now, about the pressure sensor. Do you already have the sensor that you are going to use, could you share the link of the product?
If you don’t have it, here’s a good option:
That you can use with the
To be able to use it with an Arduino
When you say connect it via BLE you mean the sensor with a microcontroller and connect these to another microcontroller via BLE?
Thank you so much for your detailed answer.
Very useful. A couple of questions for the scale
- A need a thiner scalr, so that construction might be to high for my needs: What do you think about this one:
- Bluetooth capabilities for the scale: Which module should I look to allow bluetooth connections (for App)? Os is ti better to use a micro with BT capabilities built in? Like this one for exmaple:
Thanks again
Regarding the pressure sensor:
- I have no doubt it is a great sensor, but it seems a litterl bit pricey for my actual needs. What do you thnik about this one:
Although I am looking for M6, not G1/4
- And about your question, I actually did not have a clear idea of what I needed. I was thinking at first to connect the pressure transmitter via Bluetooth to the microcontroller in the scaler, but I thinks is less flexible than connecting it to a microcontroller (in a capsule somehow) and the via BLE to a cell phone/table (app) or to another microcontroller.
- A need a thiner scalr, so that construction might be to high for my needs: What do you think about this one:
I’m not entirely sure what you mean by thinner scale as the thickness of the scale will really depend on how big the load cells are and how you build it. However if you prefer getting an already built scale the option you linked seems good, but keep in mind that the accuracy is ±0,2% which means that in full scale (1000gr) it would be ±20gr which is far from the precision you mentioned.
- Bluetooth capabilities for the scale: Which module should I look to allow bluetooth connections (for App)? Os is ti better to use a micro with BT capabilities built in? Like this one for exmaple:
For wireless capabilities I suggest checking the Data Telemetry section of the store, if you are only interested in Bluetooth check the Bluetooth section. A very popular option is the ESP32
- I have no doubt it is a great sensor, but it seems a litterl bit pricey for my actual needs. What do you thnik about this one:
That also seems like a good option
- And about your question, I actually did not have a clear idea of what I needed. I was thinking at first to connect the pressure transmitter via Bluetooth to the microcontroller in the scaler, but I thinks is less flexible than connecting it to a microcontroller (in a capsule somehow) and the via BLE to a cell phone/table (app) or to another microcontroller.
Well, the pressure sensor options I’ve found don’t have Bluetooth capabilities so you wouldn’t be able to connect it to anything wirelessly, so I believe the best option would be connecting it (with wires) to a small microcontroller with Bluetooth and then connecting that “capsule” to a different microcontroller via Bluetooth.
Thanks so much. All clear, and you were right about the scale precision