# PulseCounter
[pulse counter](/latest_en/api-reference/predefined_objs/pulsecounter.md) is an example of an ACT.
The pulse counter counts the number of rising or falling pulses of a signal without intervening microcontroller. It can be used to count irregular pulses and send wireless packets when the count reaches a certain number of times.
## Function of ACT
* Counts the pulses connected to DIO8 on the Child Node side and transmits them wirelessly after a certain period of time or when a certain number of counts are detected.
* The Child Node side operates while sleeping.
## How to use ACT
### Required TWELITE
| Role | Example |
| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Parent Node | MONOSTICK BLUE or RED
ACT Parent\_MONOSTICK in action.。
|
| Child Node | 1. TWELITE DIP
2. BLUE PAL or RED PAL +environmental sensor pal AMBIENT SENSE PAL
|
## Explanation of ACT
### setup()
```cpp
// Pulse Counter setup
PulseCounter.setup();
```
Initializes the pulse counter.
### begin()
```cpp
void begin() {
// start the pulse counter capturing
PulseCounter.begin(
100 // 100 count to wakeup
, PIN_INT_MODE::FALLING // falling edge
);
sleepNow();
}
```
Starts the pulse counter operation and performs the first sleep. The first parameter of `PulseCounter.begin()` is the count number `100` to generate a wake-up interrupt, and the second is the falling detection `PIN_INT_MODE::FALLING`.
### wakeup()
```cpp
void wakeup() {
Serial << mwx::crlf
<< "--- Pulse Counter:" << FOURCHARS << " wake up ---"
<< mwx::crlf;
if (!PulseCounter.available()) {
Serial << "..pulse counter does not reach the reference value." << mwx::crlf;
sleepNow();
}
}
```
Checks `PulseCounter.available()` when waking up. available, that is, `true`, indicates that the count is greater than or equal to the specified count. If it is `false`, it resleeps.
If the count is more than the specified number, `loop()` processes the transmission and waits for the completion of the transmission.
### loop()
```cpp
uint16_t u16ct = PulseCounter.read();
```
Reads the pulse count value. The counter is reset after the readout.
---
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