STM8 Ultrasonic water tank monitor

Back to STM8 code samples home page.

Here is an actual project for the STM8, specifically the stm8s103f3.

The "Tank Monitor" is a system to display the amount of water in a tank, and to give useful information on water usage. This is designed for an International Bulk Container ("tote"), but other water tanks can use this if there is a way to mount the ultrasonic sender on the inside, pointed down.

All parts of this system are very inexpensive and easily bought on eBay. CPU module: $1.03, Display: $1.88, Range Finder: $1.25, Wires: $0.25 You will also need a 5-volt power supply. A cheap micro-USB cell phone charger is probably fine. The CPU programmer is $2.50

If you would like to monitor and record the water level with a computer, you can get a TTL to USB converter for $1.00 to $1.50 With this, you can use a terminal program and save the information every second and use it as historical data.

The ultrasonic range finder is "HC-SR04" and is probably usable to a distance of 10 to 12 feet.

DISPLAY MODES:

The display can show what you are interested in viewing. Change the mode by pressing one of the mode buttons under the display.

Example displays:
1. "L 250.5" Water level in Gallons
2. "L 1000 L" Water level in Liters
3. "L 100 PC" Water level in Percentage of full
4. "P 12345" Water level Ping time (for calibration)

You can download the all the source code HERE. This has the Makefile, and all the libraries and headers needed to build using SDCC.

SHOPPING LIST


CPU and board
As low as $1.08

Display and key module
As low as $1.88

Ultrasonic module
As low as $0.73

Right angle headers
40 pin, 17 pieces
As low as $1.74

Jumper wires, 40
As low as $1.00

PICTURES



Questions or comments? Feel free to contact me:
richard@hodges.org

I am currently available for software development projects.

Last page update: December 21, 2018
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