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Summary of Contents for Shimmer Shimmer3
- Page 1 Copyright © Shimmer Research 2013 Realtime Technologies Ltd IMU User Manual All rights reserved Rev 1.1 Shimmer3 Bridge Amplifier+ Expansion Board User Guide Revision 1.6...
- Page 2 Neither the name of Shimmer Research, or Realtime Technologies Ltd. nor the names of its contributors may be used to endorse or promote products derived from this document without specific prior written permission.
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Page 3: Table Of Contents
Secure connection between Shimmer and expansion board ..........11 Appendices......................... 12 8.1. Assembly ..........................12 Opening the Bridge Amplifier+ enclosure ..................12 8.2. Recommended accessories ....................12 Philips 21091A Technical Data ...................... 12 8.3. How to Connect a Wheatstone Bridge to the Shimmer Bridge Amplifier ......13... -
Page 4: Introduction
The Shimmer Bridge Amplifier+ Module contains a bridge amplifier, excitation source, and connector enabling force measurement with Shimmer. The expansion board is ideal for all load, weight, force, torque, and pressure measurements through the connection of a user-supplied strain gauge based bridge sensor or load cell. -
Page 5: General Information
2. General Information 2.1. Pre-Requisites A Shimmer3 device programmed with appropriate firmware. o LogAndStream (v0.6.0 or greater) can be used to simultaneously log data to SD card and stream data over Bluetooth. o SDLog (v0.12.0 or greater) can be used to log data to the SD card. -
Page 6: Hardware Considerations
3.5 mm jacks on the board and their corresponding functions are listed in Table 3-1 and Table 3-2. For details on the connections for J6 and J7, which connect the board to the Shimmer3 mainboard, please refer to the Shimmer User Manual, which can be downloaded from the Shimmer website. -
Page 7: Output Signals
Table 3-1. 3.2. Output Signals Table 3-3 below lists the ADC channel of the Shimmer3 to which each of the output signals from the Bridge Amplifier+ Expansion Board is connected. -
Page 8: Using The Bridge Amplifier+ Module
Rev 1.6 4. Using the Bridge Amplifier+ Module 4.1. Load Cell Calibration: Calculating Load To convert the output of the Shimmer to a quantifiable unit you require: Output specification for the load cell device you are using in mV/V. -
Page 9: Firmware Considerations
Users should note that the excitation voltage for the load cell connection is enabled via GPIO_INTERNAL1. The amplifier for the Resistance input is enabled via Internal Expansion Power (EXP_RESET_N). See the Shimmer3 User Manual for more details on these pins. -
Page 10: Hardware Customisation
Copyright © Shimmer 2016 Realtime Technologies Ltd Shimmer3 Bridge Amplifier+ User Guide All rights reserved Rev 1.6 6. Hardware Customisation DISCLAIMER: We recognize the variation in gain and ranges of interest when performing research with load cells. Hardware customization is best discussed with our engineers at the... -
Page 11: Troubleshooting
Shimmer fits the Superdots by stretching them around the edges of the Expansion Board. This ensures that the adhesive doesn't prevent the connectors from making a good connection and there is enough adhesive to secure the boards together but not to interfere with the fit. Note: Shimmer does not supply Superdots. -
Page 12: Appendices
Opening the Bridge Amplifier+ enclosure Whilst the Shimmer3 enclosures can be opened to allow users to change the SD card, it is important to note that the plastic enclosures are not designed for regular opening and closing. In particular, it is recommended that the screws not be removed and reinserted on a regular basis as damage to the plastic by over-use of the screw mechanism will occur. -
Page 13: How To Connect A Wheatstone Bridge To The Shimmer Bridge Amplifier
Shimmer3 Bridge Amplifier+ User Guide All rights reserved Rev 1.6 Shimmer performed an in-house calibration of the resistance amplifier output with the Philips 21091A skin-surface temperature probe inserted using Vernier’s Direct-Connect Temperature Probe . Shimmer found the relationship between the resistance amplifier channel output and temperature in C to be logarithmic. - Page 14 Copyright © Shimmer 2016 Realtime Technologies Ltd Shimmer3 Bridge Amplifier+ User Guide All rights reserved Rev 1.6...
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