Summer is now in full swing, which means that mowing the lawn once a week is starting to get old. So why not build a robot do it for you? That’s what [Blake Hodgson] did, and he’s never been happier. It only took him a couple of weeks of quality time at one of the local makerspaces.
[Blake] was showing off Lawn da Vinci at this year’s Kansas City Maker Faire. He had his own booth around the corner from Hammerspace, the shop where it all came together. [Blake] started with a standard push mower from a garage sale and designed a frame around it using OnShape. The frame is made from angle iron, so it’s strong enough that he can ride on the thing. To each his own, we say. The wheels and motors came from a mobility scooter and match the beefiness of the frame. These are powered by two 12v car batteries wired in series. He drives it around his yard with an R/C airplane controller.
Lawn da Vinci’s brainpower comes from two Arduino Pro Minis and a Raspberry Pi. One Arduino controls the motors and the R/C signal from the remote. The other runs some extra kill switches that keep the Lawn da Vinci out of trouble.
So what’s the Raspi for? Right now, it’s for streaming video from the webcam attached to a mast on the frame back to his phone. [Blake] says he has had some latency issues with the webcam, so there could be a pair of drone racing goggles in his future. He also plans to add a GPS logger and to automate part of the mowing.
Now, about those kill switches: there are several of them. You probably can’t have too many of these on a remote control spinning suburban death machine. Lawn da Vinci will stop grazing if it goes out of range of the remote or if the remote is turned off. [Blake] also wired up a dedicated kill switch to a button on the remote and a fourth one on a separate key fob.
The Lawn da Vinci is one of many example projects that [Blake] uses to showcase the possibilities of KC Proto, a company he started to help local businesses realize their ideas by offering design solutions and assistance with prototyping. Between mowings, [Blake] puts the batteries on a trickle charger. If you make your own robot lawn mower, you might consider building a gas and solar hybrid.
If you want to sell a toy for the toddler crowd, it ought to be pretty close to indestructible. A lot of toys out there are just plain nonsense game-wise and therefore waste their beefy potential. [2dom]’s wife was close to throwing out such a toy—a Little Tikes Goofy Ball. The thing literally does nothing but let you push its big buttons in. After some time passes, it pops them back out again and giggles. Game over. [2dom] rescued it from the trash and turned it into a toy that plays math games.
[2dom] removed the existing board and replaced it with an Arduino Pro Mini and a Darlington array that drives the motor that pops the buttons back out, the speaker, and a Nokia 5110 screen. Upon startup, the user chooses between addition, subtraction, and multiplication questions using the appropriate button. Questions appear in the middle of the screen and multiple choice answers in the corners.
Choose the right answer and the ball cheers and shows one of a few faces. Choose the wrong answer and it makes a buzzing sound and shows an X. There is an adaptive level system for the questions that [2dom] doesn’t show in the demonstration video after the break. For every five correct answers, you level up. His 3- and 5-year-olds love it. For more advanced teachable moments, there’s this toy-turned-enigma-machine.
Continue reading “Mindless Toddler Toy Becomes Teaching Tool”
Need a good excuse to duck out on the family over the holidays and spend a few hours in your shop? [Jens] has just the thing. He built a color-mixing toy that looks great and we’d bet you have everything on-hand necessary to build your own version.
The body of the toy is an old router case. Who doesn’t have a couple might-be-broken-but-I-kept-it-anyway routers sitting around? Spray painted red, it looks fantastic! The plastic shell hosts 6 RGB LEDs, 3 toggle switches, and 2 buttons. [Jens] demonstrates the different features in the demo video below. They include a mode to teach counting in Binary, color mixing using the color knobs, and a few others.
Everything is driven by an Arduino Pro Mini. The lights are APA106 LEDs; a 4-pin through-hole package version of the WS2812 pixels. You could easily substitute these for the surface mount varieties if you just hot glue them to the underside of the holes in the panel. We’d love to see some alternate arrangements for LEDs and a couple more push buttons for DIY Simon Says.
Continue reading “Build Some Entertainment for Young Holiday Guests”
Disco Floor’s are passé. [dennis1a4] turned them upside down and built an awesome RGB LED ceiling display using some simple hardware and a lot of elbow grease. His main room ceiling was exactly 32 ft x 20 ft and using 2 sq. ft tiles, he figured he could make a nice grid using 160 WS2812B RGB LEDs. A Teensy mounted in the ceiling does all the heavy lifting, with two serial Bluetooth modules connected to it. These get connected to two Bluetooth enabled NES game controllers. Each of the NES controller is stuffed with an Arduino Pro Mini, a Bluetooth module, Li-Ion battery and a USB charge controller.
Bluetooth is in non-secure mode, allowing him to connect to the Teensy, and control the LEDs, from other devices besides the NES controllers. The Teensy is mounted at the centre of the ceiling to ensure a good Bluetooth link. Programming required a lot of thought and time but he did manage to include animations as well as popular games such as Snake and Tetris.
The hard part was wiring up all of the 160 LED pixels. Instead of mounting the 5050 SMD LED’s on PCBs, [dennis1a4] wired them all up “dead bug” style. Each pixel has one LED, a 100nF decoupling capacitor, and 91 ohm resistors in series with the Data In and Data Out pins – these apparently help prevent ‘ringing’ on the data bus. Check the video for his radical soldering method. Each SMD LED was clamped in a machine shop vice, and the other three parts with their leads preformed were soldered directly to the LED pins.
The other tedious task was planning and laying out the wiring harness. Sets of 10 LEDs were first wired up on the shop bench. He then tacked them up to the ceiling and soldered them to the 14 gauge main harness. The final part was to put up the suspended ceiling and close the 2 sq. ft. grids with opaque plastic.
[dennis1a4] did some trials to figure out the right distance between each LED and the panel to make sure they were illuminated fully without a lot of light bleeding in to adjacent panels. This allowed him to get away without using baffles between the tiles.
Check out the video to see a cool time-lapse of the whole build.
Continue reading “RGB LED Ceiling Display”
Old Mini and Mainframe computers often had huge banks of diagnostic lights to indicate the status of address, data and control buses or other functions. When the lights blinked, the computer was busy at work. When they stopped in a particular pattern, engineers could try and figure out what went wrong by decoding the status of the lights.
[Folkert van Heusden] has an old MSX-based Philips VG-8020 computer and decided to add his own set of BlinkenLights to his system. The VG-8020 was a first generation MSX released in 1983 and featured a Zilog Z80A microprocessor clocked at 3.56 MHz, 64KB of RAM, 16KB of VRAM, and two cartridge slots.
The cartridge slots of the MSX are connected to the address and data buses in addition to many of the control signals, so it seemed logical to tap in to those signals. Not wanting to play around with a whole bunch of transistors, he opted to use an Arduino Nano to connect to his computer and drive the LEDs. In hindsight, this seemed like a wise decision as it allowed him to do some processing on the incoming data before driving the LEDs.
Instead of creating a new PCB, he cut open one of his beloved game cartridges. A switch was added to the slot select control pin (SLTSL) and eight wires soldered directly to the data bus. These were hooked up as inputs to the Arduino. A bank of eight LEDs with limiting resistors were connected to outputs on the Arduino. A quick test confirmed it all worked, including the switch to enable / disable the cartridge. He had to experiment with the code a bit as the LEDs were initially blinking too fast.
A couple of months later, he upgraded his BlinkenLight display to include the 16 bit address, 8 bit data and 8 lines for control signals. To do this, he used two MCP23017 – I2C 16 input/output port expander chips. For the LEDs, he installed a bank of four NeoPixel LED bars. A Pro-Mini takes care of the processing, and a custom PCB in the cartridge format houses all of it neatly. Check out the two videos below showing the BlinkenLights in action.
And if these BlinkenLights got you interested, take a look at this awesome Z80 Computer With Switches And Blinkenlights that has a hand operated crank to advance clock cycles.
Continue reading “MSX with BlinkenLights”
If you ever find yourself swapping between a mix of audio inputs and outputs and get tired of plugging cables all the time, check out [winslomb]’s audio multiplexer with integrated amplifier. The device can take any one of four audio inputs, pass the signal through an amplifier, and send it to any one of four outputs.
The audio amplifier has a volume control, and the inputs and outputs can be selected via button presses. An Arduino Pro Mini takes care of switching the relays based on the button presses. On the input side, you can plug in devices like a phone, TV, digital audio player or a computer. The output can be fed to speakers, headsets or earphones.
At the center of the build lies a TI TPA152 75-mW stereo audio power amplifier. This audio op-amp is designed to drive 32 ohm loads, so performance might suffer when connecting it to lower impedance devices, but it seems to work fine for headphones and small computer speakers. The dual-gang potentiometer controls the volume, and the chip has a useful de-pop feature. The circuit is pretty much a copy of the reference shown in the data sheet. Switching between inputs or outputs is handled by a bank of TLP172A solid state relays with MOSFET outputs, and it’s all tied together with a micro-controller, allowing for WiFi or BLE functionality to be added on later.
[winslomb] laid out the design using Eagle and he made a couple of footprint mistakes for the large capacitors and the opto-relays. (As he says, always double-check part footprints!) In the end, he solder-bridged them on to the board, but they should probably be fixed for the next revision.
[winslomb] built the switch as his capstone project while on his way to getting a Masters in EE, and although the device did function as required, there is still room for improvement. The GitHub repository contains all the hardware and software sources. Check out the video below where he walks through a demo of the device in action. If you are looking for something simpler, here is a two input – one output audio switcher with USB control and on the other end of the spectrum, here’s an audio switch that connects to the Internet.
Continue reading “Escape Cable Hell with an Audio I/O Multiplexer”
[Rohit Gupta] is back with a plotter made from scrap CD drives and an old RC servo. [Rohit] is working on hacks to create CNC machines and sharing his activities with the world. His CNC design calls for salvaged stepper motors so he first built a device for testing them. You’ve got to admire his use of the language. He named his plotter project ‘Sketchy’ and his motor tester is called ‘Easy Peasy’.
After finding some CD drives at the scrap pile he tore them down to test with Easy Peasy. The raw materials for the frame came from a wooden crate for an AC unit but he didn’t just start cutting it up. Nope, first he created plans with CAD; now that’s a hack you have to admire.
With the steppers tested working, and the base build under way he moved onto the control system. Originally the hardware was demonstrated using an MSP430. This worked, but a flaw in the hardware design was found. With the pen attached directly to the servo horn, it would draw a long line when being rotated away from the drawing position.
The fix is a replacement servo setup which lifts the pen up instead of rotating it. But that showed that the drawing surface wasn’t smooth. The pen kept missing places or getting caught and destroyed. The use of a spring loaded pen solved this issue. Success!
One further change migrated away from the MSP430 in favor of an Arduino Pro Mini in order to use a GRBL library instead of the g-code generator which was performing questionably. Since he likes Hackaday so much one of his first attempts with the final version of Sketchy was our logo, shown in the video after the break.
When we last saw [Rohit] he had created a fancy PCB ruler to measure components.
Continue reading “A Wooden Based, CD Stepper Scribbler”