RIOT-002B
Environment Sensing Board RIOT-002B
NO.EEV-627-221011
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1. Overview
The RIOT-002B is an environment sensing board consisting of one board, which is the RIoT2 Main
Board equipped with a secondary battery of CT04120 manufactured by Murata Manufacturing Co., Ltd.
It can send information of a temperature, humidity, and atmospheric pressure sensor, an ambient light
sensor, and a 3-axis acceleration sensor mounted on the RIOT-002B to a tablet or other devices using
Bluetooth Low Energy (BLE) and can be operated with an indoor-use photovoltaic panel (*1).
The secondary battery mounted on the RIOT-002B stores electric power extracted efficiently from a
photovoltaic panel by the R1801, a buck DC/DC switching regulator for energy harvesters. The RP605,
an ultra-low consumption current buck-boost DC/DC switching regulator, and the RP118, a voltage
regulator, efficiently supply electric power to a built-in BLE module in a MCU and various sensors. The
RP605 also has a function to monitor the voltage of the secondary battery, which can be checked by
sending it to a tablet or other devices as BLE data via an AD converter (ADC) of the BLE module.
In addition, this product has the R2221, a real-time clock IC, and it can set any desired operating day of
the week and operating start/end time, such as 8:00 to 19:00, by using a dedicated application.
(*1) A photovoltaic panel not included.
Figure 1. RIOT-002B
RIOT-002B
NO. EEV-627-221011
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2. Board Specifications
2-1. Block Diagram
Figure 2. Block Diagram of RIOT-002B
2-2. Electrical Characteristics
Table 1. Main Electrical Characteristics
(RIOT-002B recommended operating ambient temperature: 0 to 50℃)
Symbol Parameter Condition Min. Typ. Max. Unit
Vin Operation Available
Input Voltage
2.30 - 5.50 V
Vmp Minimum Chargeable
Input Voltage
(*2) 4.40 V
Vlib Secondary Battery
Charging Voltage
(*2) 2.62 2.70 2.78 V
Vsys Sensor System Input
Voltage
Vsys1 and Vsys2 1.77 1.80 1.83 V
Icc Avg. Operating
Current
5 Seconds Intermittent
Operation
22 uA