Realizing a Low-cost Water Level Measurement Solution Using the RX130’s Capacitive Touch Key
With the advancing of IoT, more and more sensors have been mounted on equipment to monitor and notify the users of the status. Particularly in the fields of home appliances and OA equipment, it is expected that the demand will grow for applications like monitoring the amount of remaining expendable items such as water or ink, and sending a notification to refill it.
However, when implementing a floating type or weight sensor to measure the amount of remaining water or ink, the cost would increase due to replacement of deteriorated parts, implementation of high-cost sensor elements and peripheral circuits.
To address these challenges, Renesas provides a reference design demo that measures the amount of remaining liquid, keeping the cost low.
This demo applies the capacitive touch key solution to measure the water level with a one-channel self-capacitive electrode and a one-channel shielded electrode. This system consists only the RX130 MCU with Capacitive Touch Sensor Unit (CTSU) and a low cost copper electrodes. There is no need for additional electric components such as floating type sensor, and the cost can be reduced as the electrodes do not deteriorate easily.
The demo is configured with the RX130 CPU board, 2 water tanks, copper electrodes for water level detection, a pump for changing the water level, and the demo control board connecting them. You can check the demo operation when connecting the RX130 CPU board to the PC.
The procedure for the demo is as below.
1. Get the sample software for water level measurement from the Renesas web page.
2. Download the sample software to RX130 using the Integrated Development Environment (IDE), e2 studio.
3. Press the switch to transfer water between tanks using the pump.
You need only 3 steps to confirm the changes in water level in real-time using the dedicated monitoring software.
Renesas provides the sample software for water level measurement demo system and the reference design such as the circuit diagram and the electrode pattern, enabling you to evaluate and start to develop the system immediately.
Please consider replacement of the existing sensing system or installation of new one by using RX Family MCU with CTSU.
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