Tanklevel

Tank level meter
Status	Stable
menuconfig	Applications->Tank level meter
Pinning	yes
Ecmd	yes
Depends on	ECMD, Clock, ADC, Cron (optional)
Code	https://github.com/ethersex/ethersex/tree/master/services/tanklevel

Tanklevel provides an application for measurement of tank levels by hydrostatic pressure.

Internals

You need an aquarium air pump, some kind of pipe/tube, a Freescale MPX5050DP pressure sensor and an relay for the pump. Parameters are configurable by ECMD and stored in EEPROM.

Mechanical setup

                   +-------+
                   |Sensor |
                   +---+---+
                       | +--------+
       +---------------+-+  Pump  |
       |                 +--------+
+------+------+
|      |      |
|      |      |
|------|------|
|      |      |
|      |      |
|      |      |
+-------------+
     Tank

See the following example:

Electrical setup

Electrical Setup is quite simple. Connect the TANK_PUMP port with an relay (usually via an Transistor as current amp) and the output of the Sensor with the selected ADC channel (have a look at the datasheet for power supply decoupling and output filtering). Select a optimal Vref for the ADC if possible. Schematic could look like this: