source

pico_ada_c07_buzzer

1.8.0

Chapter 7: Controlling active and passive Buzzer

Website Community CIResults Version page Download JSON

1.8.0

Learn how to drive active and passive buzzers with the Raspberry Pi Pico using Ada. From simple doorbell switches to PWM-generated sweeping alert tones - including hardware tips with flyback diodes and oscilloscope measurements.

In this chapter we connect both active and passive buzzers to the Pico. We start with a simple button-controlled doorbell, improve the passive buzzer with bit-banging, and finally create a clean sweeping alert tone using the Pico's PWM hardware. We also look at inductive-load protection and why a diode is essential.

Contained in Chapter 07 are:

  1. sketch_07_1_doorbell.adb - Chapter 7.1 Doorbell with active buzzer
  2. sketch_07_2_alert.adb - Chapter 7.2 Alert with passive buzzer
  3. pwm_alert.adb - Use PWM to drive an passive buzzer
  4. buzz_and_blink-main.adb - Use tasks to drive both a buzzer and an LED

Read the full tutorial at Chapter 7: Controlling a Buzzer, GNATdoc documentation, SourceForge repository

Authors
Martin Krischik <krischik@users.sourceforge.net>
Maintainers
Martin Krischik <krischik@users.sourceforge.net>
Maintainer profiles
@krischik
Licenses
GPL-3.0-or-later
Website
https://pi-ada-tutorial.sourceforge.io/pico_ada_c07_buzzer
Release archive
sourceforge.net/projects/pi-ada-tutorial/files/Alire/pico_ada_c07_buzzer-1.8.0.tgz
Tags
raspberry, pi, pico, rp2040, tasking, light-tasking, ada2022, embedded
Executables
buzz_and_blink-main, pwm_alert, sketch_07_1_doorbell, sketch_07_2_alert
Manifest
index/pi/pico_ada_c07_buzzer/pico_ada_c07_buzzer-1.8.0.toml
Build and platform metadata 3 fields
Build switches
{
  "*": {
    "ada_version": [
      "-gnat2022"
    ]
  },
  "development": {
    "compile_checks": "Warnings",
    "contracts": "Yes",
    "runtime_checks": "Overflow"
  },
  "release": {
    "compile_checks": "Warnings",
    "contracts": "No",
    "runtime_checks": "Default"
  },
  "validation": {
    "compile_checks": "Warnings",
    "contracts": "Yes",
    "runtime_checks": "Everything"
  }
}
Configuration
{
  "values": {
    "embedded_rp2040": {
      "Board": "rpi_pico",
      "Max_CPUs": 2
    },
    "pico_xbsp": {
      "Variant": "tasking"
    },
    "rp2040_hal": {
      "Interrupts": "bb_runtimes",
      "Use_Startup": false
    }
  }
}
Additional origin data
{
  "hashes": [
    "sha256:59471c77782092b301fd1e8526893cab949d57f4da618b50718b908586f180f5",
    "sha512:0b2248d3575a9c46f9c21b665076b68c2e05d759f7ecd9a6471c64dbf2729a30124b99aa3a5da80213c4c7805b7e4980fcb2f24c3b0d61294932d4f9410bc8c6"
  ]
}