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Fuel Flow Meter Arduino Code: Build an Affordable Pulse Tracker for Small Combustion Engines
Quick Answer: An Arduino pulse tracker can read a 5 V square wave from an inline fuel flow meter. Total fuel used is total pulses divided by the meter K factor. Flow rate in L/h is pulse frequency divided by K factor times 3600. Silver Automation Instruments supplies small DN4 to DN10 pulse-output flow meters for diesel, gasoline, and light fuel oil.
Where This Build Works in the Field
Small combustion engines run generator sets, irrigation pumps, fishing boat engines, and small compressors. A 10 kW diesel generator burns about 1 to 4 L/h at partial load. Fleet operators in Indonesia or Nigeria often have no reliable fuel consumption data. An Arduino based pulse counter with a small oval gear flow meter solves that for under 200 USD in parts. In practice, this setup is used for short-term engine tests, generator run-in checks, and field service diagnostics.
How a Fuel Flow Meter Pulse Output Works
A positive displacement oval gear meter passes fuel through two rotating oval gears. Each rotation moves a fixed volume. A Hall effect sensor or reed switch generates one pulse per small volume. The K factor is the number of pulses per liter. A diesel meter may have a K factor of 2000 to 6000 pulses per liter. Gasoline turbine meters can be higher. Most engineers skip the analog side because the signal is already a clean square wave. Arduino reads the rising edge and increments a counter.
Arduino Code Structure for a Pulse Tracker
Use pin 2 or pin 3 on an Arduino Uno. These pins support external interrupts. In setup, set the pin mode with INPUT_PULLUP and attach an interrupt to the RISING edge. Keep the interrupt service routine short. Inside it, write pulseCount = pulseCount + 1. In loop, divide pulseCount by the K factor to get total volume in liters. To calculate flow rate, count pulses during a 1000 ms window. Multiply the one second pulse count by 3600 and divide by K factor. A reading of 20 pulses per second with a K factor of 4000 gives 18 L/h. Do not use delay in the loop. Use millis for timing.
Matching the Flow Meter to a Small Engine
Fuel type matters more than pipe size. Diesel and light fuel oil work well with oval gear meters. Gasoline needs compatible seals. Small engines need low flow range: 0.2 to 10 L/h for a 5 kW engine, 1 to 30 L/h for a 20 kW engine. A DN4 or DN6 meter fits the small fuel hoses typical on portable generators and marine engines. Silver Automation Instruments supplies alumi
Field Wiring Notes That Avoid False Pulses
Here is the thing: ignition noise from small petrol engines will trigger false counts if the wiring is weak. Use a 10k pull-up resistor for open collector outputs. Keep the Arduino close to the meter or use shielded cable. Add a 100 nF capacitor from the signal input to ground. In one case, a fishing boat in Vietnam had unstable pulse readings until the flow meter body was bonded to the Arduino ground. After that fix, total fuel consumption matched the tank dipstick within 2 percent.
From Arduino Testing to Industrial Fuel Flow Measurement
An Arduino pulse tracker is a good development tool. It is not a custody transfer device. For permanent measurement, hazardous areas, or remote monitoring, use an industrial flow transmitter with 4-20 mA HART output or a local flow totalizer. A paint manufacturer in Southeast Asia started with an Arduino rig to compare burner efficiency. Later they ordered stainless steel oval gear meters with local totalizers for three production lines. That path saves time and avoids a failed compliance audit.
FAQ: Fuel Flow Meter Arduino Code for Small Engines
Which Arduino pins can read a fuel flow meter pulse?
Use digital pin 2 or 3 on an Arduino Uno. These pins support external interrupts. Connect the flow meter ground to Arduino ground.
What K factor should I use for a small diesel engine flow meter?
A typical oval gear diesel meter has a K factor of 2000 to 6000 pulses per liter. Check the calibration sheet for your meter.
Can I power the flow meter from Arduino?
A reed switch meter may need no power. A Hall effect meter usually needs 5 to 24 V DC. Check the sensor specification before wiring.
How do I convert pulse frequency to L/h?
Multiply pulses per second by 3600 and divide by the K factor. For example, 20 pulses per second with a K factor of 4000 is 18 L/h.
Does Silver Automation Instruments sell flow meters for engine testing?
Yes. We provide pulse-output oval gear and turbine flow meters for diesel, gasoline, and light fuel oil. Send your fuel type, flow range in L/h, pipe size DN, and signal type. Contact Tel: +86-25-68650347. Whatsapp: +86-25-52155837. WeChat: +86 15365082610.