Change internal logic from relays to an Arduino
Not Touching the Puzzle
The else
function block (lines 48-53) starts the counterpoint to the if
on line 37. In this case, the handles are not touching the puzzle, so I clear iMotorReset1
by setting it to
and perform a debug print to show that the motor has been turned off.
The Long Timeout
The if
block in lines 70-76 checks two conditions: Is millis
(current time) greater than ulMotor1
, the long timeout value, and is a timeout timer active (ulMotor1
is not equal to
)? When the handle touches the puzzle, the delay is set for 10 seconds. If the handle remains in contact with the puzzle for that long, the motors are shut off.
The digitalWrite
functions in lines 72 and 73 turn the motors off by setting the output pin to HIGH
and turning off the relay. Line 74 sets the iMotorReset1
flag, and the final function sends the debug message Motor Timeout to indicate that the handle was left on the puzzle too long.
The Shorter Timeout
The simpler if
block (lines 85-90) checks whether the short timer has been exceeded. Once the handle comes off the puzzle, it continues to buzz for half a second before you can continue your attempt. The digitalWrite
functions in lines 87 and 88 do the work of turning the relays (and thus the motors) off; then, ulMotor1
is reset to
so that the buzzer can be triggered again the next time the circuit is triggered.
« Previous 1 2 3 4 Next »
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.
![Learn More](https://www.linux-magazine.com/var/linux_magazin/storage/images/media/linux-magazine-eng-us/images/misc/learn-more/834592-1-eng-US/Learn-More_medium.png)
News
-
NVIDIA Released Driver for Upcoming NVIDIA 560 GPU for Linux
Not only has NVIDIA released the driver for its upcoming CPU series, it's the first release that defaults to using open-source GPU kernel modules.
-
OpenMandriva Lx 24.07 Released
If you’re into rolling release Linux distributions, OpenMandriva ROME has a new snapshot with a new kernel.
-
Kernel 6.10 Available for General Usage
Linus Torvalds has released the 6.10 kernel and it includes significant performance increases for Intel Core hybrid systems and more.
-
TUXEDO Computers Releases InfinityBook Pro 14 Gen9 Laptop
Sporting either AMD or Intel CPUs, the TUXEDO InfinityBook Pro 14 is an extremely compact, lightweight, sturdy powerhouse.
-
Google Extends Support for Linux Kernels Used for Android
Because the LTS Linux kernel releases are so important to Android, Google has decided to extend the support period beyond that offered by the kernel development team.
-
Linux Mint 22 Stable Delayed
If you're anxious about getting your hands on the stable release of Linux Mint 22, it looks as if you're going to have to wait a bit longer.
-
Nitrux 3.5.1 Available for Install
The latest version of the immutable, systemd-free distribution includes an updated kernel and NVIDIA driver.
-
Debian 12.6 Released with Plenty of Bug Fixes and Updates
The sixth update to Debian "Bookworm" is all about security mitigations and making adjustments for some "serious problems."
-
Canonical Offers 12-Year LTS for Open Source Docker Images
Canonical is expanding its LTS offering to reach beyond the DEB packages with a new distro-less Docker image.
-
Plasma Desktop 6.1 Released with Several Enhancements
If you're a fan of Plasma Desktop, you should be excited about this new point release.