# Load Cell

Adding a Stagehand Pro 4 or 5 and a machine with a compatible load cell to Spikemark 5 allows you to see live load cell data in Spikemark and on the Stagehand Motion Controller. You can also set overweight and underweight thresholds to automatically stop motion.

## What you Need

To use this killer feature you will need the following:

* [Spikemark 5](/docs/spikemark/spikemark-installation.md)
* [Stagehand Pro 4](/docs/stagehand/stagehand-pro-ac.md) or later
* 4-20mA load cell

### Creative Conners Machines

Load cells are currently available on the following Creative Conners machines:

* [CM Smart Chain Hoist](/docs/machinery/smart-chain-hoist.md) - The CM Smart Chain Hoist can use the integral hook load cell or a shackle style load cell.
* [Floorpocket](/docs/machinery/floorpocket.md) - The Floorpocket uses a load cell at the motor to measure torque.
* Spotline v2

No matter the machine, load cells are only serviceable by a qualified technician.

{% hint style="danger" %}
Unfortunately, Broadweigh load shackles are not compatible with Spikemark and the Stagehand.
{% endhint %}

### Selecting A Load Cell

Load cells come in many shapes and sizes. When specifying a load cell you need to keep several factors in mind:

* Data signal - Is the load cell sending a digital or analog signal back to the reader?
* Peak loading potential - An e-stop puts large loads on the entire system, and a load cell needs to be in line in order to read the weight. Make sure it’s beefy enough to withstand the shockload of sudden stop.
* Installation criteria - Where are you actually measuring the force? A shackle is easy to identify, but a torque arm buried inside a machine can also work.

{% hint style="info" %}
There are a few ways to read the load data, but the most accessible is the **4mA to 20mA analog signal** - which is the type that is compatible with the Stagehand Pro 4 and Spikemark.
{% endhint %}

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