Copyright © Shimmer 2017
Realtime Technologies Ltd Shimmer User Manual
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16
and transferred. Battery life estimation information for a number of different configurations is
provided in section 6.2.3 and also contains further details on voltage measurement.
Some Shimmer applications feature a low-battery message using an LED indicator (located near the
reset button). There is also hardware low-battery protection which will prevent damage to the
battery or Shimmer device. If your application fails to start or terminates abruptly after initiating
streaming data over a radio or writing to flash, it could be a symptom of a battery in need of
recharging. For details on battery re-charging please refer to Section 3.2.3 of this User Manual. If you
suspect a fault with your Shimmer battery, please refer to the troubleshooting section of this
manual.
3.1.3. User button
There is an orange-coloured user button on the Shimmer3 (highlighted in Figure 3-1), whose
function is defined by firmware. Users should note that this button does not provide tactile
feedback. All firmware solutions provided by Shimmer include visual feedback when the user button
is pressed and it is recommended that any users who wish to develop firmware do the same.
3.1.4. Shimmer LED Indicators
Two software-controlled LED indicators (highlighted in Figure 3-1) are available, the lower indicator
is intended to display operational status and is tri-coloured (green, yellow, and red). The upper
indicator is bi-coloured (blue/green) and is intended to display the data communication mode or
status.
Firmware developers are encouraged to follow international standards for indicator lights, for
example:
Operational status:
o Green: Correct operation
o Yellow: Warning
o Red: Error
Data status
o Blue: Bluetooth
o Green: Sensing
3.1.5. MicroSD Card Socket
The Shimmer mainboard contains a microSD card socket to incorporate extra memory resources,
with capacities up to 32GB. This allows the additional storage of data while the Shimmer is not
streaming and ensures no loss of this data while mobile, during network outages or while changing
batteries.
You will find the microSD card socket on the corner of the PCB with a label printed on the PCB in the
socket opening. As Shimmer has a power switch on this component, there is no drawback to leaving
a card installed at all times. The card socket is spring-loaded and you can insert the card from the
side without complete disassembly.
The microSD card may be accessed using the Shimmer Dock or Consensys Base. For more
information on microSD card access please refer to Section 3.2.4 of this document.
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