RIot Environmental Sensing Board Ricoh with high energy efficiency
Published : 02/17/2020 17:24:24
The RIOT-001 is an environment sensing demo board which monitors ambient temperature, humidity, air pressure, and illuminance. The information it transmits with its Bluetooth Low Energy (BLE) can be displayed on smartphones or tablets where an application programmed for it is installed.
The RIOT-001 contains ultra-low supply current and low noise power management ICs and achieves independent power generation, prolongation of battery operating time, and high-accuracy sensing, all of which IoT edge devices require. The new sensing board can make it easy to develop new IoT edge devices and contributes to shortening the construction period of those devices.
RIoT Environment Sensing Demo Board Features
Charging from Solar Battery to Secondary Battery
The R1800, a buck DC/DC converter for energy harvesting, extracts electric power from a solar battery. The converter has a maximum power point control function to configure a voltage at which the solar battery can produce its maximum power, and therefore optimizes the amount of power generation of the solar battery. In addition, an reverse current protection prevents charging loss.
The RP604, a buck-boost DC/DC converter with ultra-low supply current, supplies electricity for an MCU, BLE, and sensors, which contributes to achieving a high-efficiency operation at both standby and active modes. The wide operating voltage from 1.8 V to 5.5 V also enables the board to make efficient use of the secondary battery power.
Battery Monitoring with Low Power Consumption
One of the conventional ways of monitoring battery voltage is to input divided voltage to the ADC of an MCU by using resistor dividers. However, this circuit structure enlarges supply current of the board. Instead, by using the RP124, an LDO regulator including a battery monitor, a low supply current battery voltage monitoring function can be constructed with ease.
As the secondary battery, the board is equipped with the SLB series (0.35 mAh) manufactured by Nichicon Corporation. When fully charged, the secondary battery can continue to operate for approximately 20 hours. Connecting a solar battery suitable for the specifications of the RIoT board enables batteryless operation.
Digimax is the official Ricoh distributor in Italy and is able to offer all the products developed by the Japanese company.