Roomba Now Able to Hunt Arnold Schwarzenegger

Ever since the Roomba was invented, humanity has been one step closer to a Jetsons-style future with robots performing all of our tedious tasks for us. The platform is so ubiquitous and popular with the hardware hacking community that almost anything that could be put on a Roomba has been done already, with one major exception: a Roomba with heat vision. Thanks to [marcelvarallo], though, there’s now a Roomba with almost all of the capabilities of the Predator.

The Roomba isn’t just sporting an infrared camera, though. This Roomba comes fully equipped with a Raspberry Pi for wireless connectivity, audio in and out, video streaming from a webcam (and the FLiR infrared camera), and control over the motors. Everything is wired to the internal battery which allows for automatic recharging, but the impressive part of this build is that it’s all done in a non-destructive way so that the Roomba can be reverted back to a normal vacuum cleaner if the need arises.

If sweeping a just the right time the heat camera might be the key to the messy problem we discussed on Wednesday.

The only thing stopping this from hunting humans is the addition of some sort of weapons. Perhaps this sentry gun or maybe some exploding rope. And, if you don’t want your vacuum cleaner to turn into a weapon of mass destruction, maybe you could just turn yours into a DJ.

Infrared Targeting On a Small Scale

Sometimes, a person has a reason to track a target. A popular way to do this these days is with a camera, a computer, and software to analyze the video. But, that lends itself more to automated systems, like sentries. What if you want to be able to target something by “painting” it with a laser?

That’s exactly what [Jeremy Leaf] wanted to do, and the results are pretty impressive. He was able to track a .06 milliwatt laser at 2 meters. His design does this using three photodiodes in order to determine the position of a laser spot using triangulation.

Once the location of the laser spot has been determined, it can either simply be reported or it can be tracked. Tracking is achieved with a gimbal setup which updates quickly and accurately. Of course, it can only track the laser if the laser has something to be projected upon. If you need to track something in open 3D space, there are alternatives that would be better suited to the task.

Continue reading “Infrared Targeting On a Small Scale”

Infrared Flashlight with Screen Uncovers What’s Hidden

Flashlights are handy around the house, but what if you want a stealthier approach to illuminating the night? Infrared LED flashlights can be acquired at relatively low cost, but where’s the fun in that? To that end [johnaldmilligan] spent a couple hours building an infrared flashlight-gun with an LED display to venture into the night.

[johnaldmilligan] disassembled a handheld spotlight to use as the housing, leaving the trigger assembly and 12V DC charge port in place. A miniature camera was used as the video source after removing its infrared filter. Note: if you do this, don’t forget that you will need to manually readjust the focus! The camera was mounted where LED Array Diagramthe flashlight bulb used to be instead of the LED array since the latter was impractically large for the small space — but attaching it to the top of the flashlight works just as effectively. The infrared LEDs were wired in eight groups of three LEDs in parallel to deliver 1.5V to each bank and preventing burnout. Here is an extremely detailed diagram if that sounds confusing.

Continue reading “Infrared Flashlight with Screen Uncovers What’s Hidden”

Hacklet 118 – Infrared and Universal Remote Controls

The first remote control for a TV was the Zenith Space Command back in the 1950’s. Space Command used sounds at ultrasonic frequencies to control the set. It wasn’t until the 1980’s and the Viewstar cable box that infrared entered the picture. Remote controls spread like wildfire. It wasn’t long before every piece of consumer electronics had one. Coffee tables were littered with the devices. It didn’t take long for universal remotes to hit the scene. [Woz] himself worked on the CL9 Core device, back in 1987. Even in today’s world of smart TV’s and the internet of things, universal remotes are still a big item. Hackers, makers, and engineers are always trying to build a device that works better for them. This week’s Hacklet is about some of the best universal and IR remote projects on!

smoteWe start with [Harikrishna] and zmote. Zmote is an open source WiFi enabled, infrared,  360° remote control. That’s a mouthful. It might be easier to say it’s an ESP8266 and some IR LEDs. An ESP-01 module connects the device to WiFi and provides the 32-bit processor which runs the show. Learning functionality comes courtesy of a TSOP1738 modulated infrared receiver. The beauty of the Zmote is in the software. REST and MQTT connectivity are available. Everything is MIT licensed, and all the code is available on Github.



Next up is [Benjamin Kenobi] with TV Remote Control, Limited. Not everyone can operate the tiny buttons on a modern remote. [Benjamin] built this device for Easton, a special kid with a disability that impairs his motor skills. The 3D printed case holds two buttons – one for power, and one to change the channel. An Arduino Nano running [Ken Shirriff’s] IR library is the brains of the operation. The IR signal timing is hard coded for simplicity. One problem [Ben] ran into was the Nano’s high current draw, even in sleep mode. Batteries wouldn’t last a week. A simple diode circuit with a reed relay keeps the Nano shut down until Easton presses a button.


openirNext we have [Nevyn] with OpenIR – Infrared Remote Control. A dead DSLR remote shutter release was all the motivation [Nevyn] needed to start work on his own universal remote control. OpenIR can be connected to (and controlled by) just about anything with a UART – a PC via an FTDI cable, a Bluetooth module, even an ESP8266. The module can be programmed by entering pulse length data through a custom Windows application. The Windows app even allows the user to view the pulses graphically, like a scope. The data is stored on an EEPROM on OpenIR’s PCB. Once programmed, the OpenIR board is ready to control the world.

onebuttonFinally, we have [facelessloser] with One button TV remote. This project may be the simplest open source remote control this side of TV-B-GONE. He wanted to build a simple remote control for his young daughter to scan between the various kids channels. A simple toggle switch turns the device on, and one button performs the rest of the magic. [Facelessloser] wanted to “move up” from an Arduino to an ATtiny85. This project became part of his ATtiny education. A custom PCB from OSH Park ties things together. A simple black project box keeps the electronics safe from tiny fingers – at least until she’s old enough to use a screwdriver.

If you want to see more IR and universal remote projects, check out our new infrared and universal remote projects list. See a project I might have missed? Don’t be shy, just drop me a message on That’s it for this week’s Hacklet, As always, see you next week. Same hack time, same hack channel, bringing you the best of!

Cute USART Trick Brings PWM to IR LEDs

We love little tricks like this. Suppose that you want to generate an IR remote’s signal. It’s easy, because most of the codes are known. But it can be slightly harder because most IR remotes and receivers modulate the on pulses with a square wave at roughly 38 kHz for background lighting immunity.

With a competent PWM generator on a microcontroller, you can create this carrier modulation easily enough yourself. Set the PWM frequency to 38 kHz and the duty cycle somewhere in the 33%-50% range, and you’re set. But what if you don’t have a competent PWM generator? Such was the case that prompted [AnalysIR Blog] to fake it, with USART.

Here’s the trick. You set up the serial port to communicate at ten times the desired carrier frequency, and then transmit “special” data. (The number ten comes from eight bits of data plus a start and a stop bit.) If you want a 50% duty cycle, you simply send 0b11110000, as fast as the microcontroller will allow, for a mark and nothing for a space.

There’s some extra detail with inverting the signal if, as most do, your USART idles high. But that’s really it. It’s a cute trick for when you’re desperate enough to need it. And if you’d like to brush up some more on your asynchronous serial skills, check out our guide on troubleshooting USART, and the great comments that ensued.

Using Missile Tech to See Like Predator

[Artem Litvinovich] wanted to see by heat vision like in the Predator movies. He not only succeeded but went on to see in color, medium-wave IR, short-wave IR, and ultraviolet using a very unique approach since his effort began back in 2009.

He started with a box based on the basic pinhole camera concept. In the box is a physical X-Y digitizer moving a photodiode to collect the thousands of points needed to create a picture. First all he got, due to the high signal amplification, was the 60 cycle hum that permeates our lives. A Faraday cage around the box helped but metal foil around the sensor and amplifier finally eliminated the noise. Now he had pictures in the near infrared (NIR). Continue reading “Using Missile Tech to See Like Predator”

Infrared Detector Selects Over a Wide Range

You can classify infrared light into three broad ranges: short wave, medium wave, and long wave. Traditionally, sensors concentrate on one or two bands, and each band has its own purpose. Short wave IR, for example, produces images similar to visible light images. Long wave is good for thermal imaging.

Researchers have announced a new detector that, by adjusting a bias, can detect all three bands using a simple approach that stacks different absorption layers over a semiconductor substrate. The device only requires two terminals and is very efficient, although the efficiency varies based on the band.

We’ve covered infrared sensing before. We’ve even seen DSLRs hacked into IR sensors. This new research might be a bit much to duplicate in your garage. After all, it requires tellurium doped gallium antimonide substrates and sophisticated processing equipment. However, this research will probably lead to practical devices that will find their way into projects before too long.