[Renee] dropped a tip to let us know about EddiePlus, her balancing robot creation. As its name might imply, EddiePlus is controlled by an Intel Edison processor. More specifically, [Renee] is using several of Sparkfun’s Edison Blocks to create Eddie’s brain. EddiePlus’ body is 3D printed, while his movement comes from two Pololu DC motors with wheels and encoders. The full build instructions are available as a PDF from [Renee’s] Google drive.
Eddie is able to balance and drive around on two wheels, much like a Segway. Sensor data for balance comes from Sparkfun’s LSM9DS0 based Inertial Measurement Unit (IMU) block. In this new “plus” version of Eddie, [Renee] has added encoders to the robot’s wheels. This makes it easier for him to adapt to changing loads – such as pumping iron (or banana plugs as the case may be). The encoders also help with varying terrain, as [Renee] demonstrates by tilting a board as Eddie drives on it. Eddie’s code is written in C, and available on Github. Controlling Eddie is as easy as sending simple commands via UDP.
As you might imagine, the Intel Edison still has plenty of cycles left over after computing Eddie’s balance. [Renee] uses some of these with a webcam based teleoperation mode.
Click past the break to see Eddie in action!
Continue reading “EddiePlus, the Edison based balancing robot”
Halloween may have come and gone, but [Luis] sent us this build that you’ll want to check out. An avid Walking Dead fan, he put in some serious effort to an otherwise simple bloody t-shirt and created this see-through “stomach shot” gunshot wound.
The project uses a Raspi running the Pi Camera script to feed video from a webcam on the back of his costume to a 7″ screen on the front. [Luis] attached the screen to a GoPro chest harness—they look a bit like suspenders—to keep it centered, then built up a layer of latex around the display to hide the hard edges and make it more wound-like. Power comes from a 7.4V hobby Lipo battery plugged into a 5V voltage converter.
After ripping a small hole in the back of his t-shirt for the webcam and a large hole in the front for the screen, [Luis] applied the necessary liberal amount of fake blood to finish this clever shotgun blast effect.
[Filipe] has been playing around with custom firmware for inexpensive IP cameras. Specifically, he has been using cameras based on a common HI3815 chip. When you are playing around with firmware like this, a major concern is that you may end up bricking the device and rendering it useless. [Filipe] has documented a relatively simple way to backup and restore the firmware on these cameras so you can hack to your heart’s content.
The first part of this hack is hardware oriented. [Filipe] cracked open the camera to reveal the PCB. The board has labeled serial TX and RX pads. After soldering a couple of wires to these pads, [Filipe] used a USB to serial dongle to hook his computer up to the camera’s serial port.
Any terminal program should now be able to connect to the camera at 115200 baud while the camera is booting up. The trick is to press “enter” during the boot phase. This allows you to log in as root with no password. Next you can reset the root password and reboot the camera. From now on you can simply connect to the phone via telnet and log in as root.
From here, [Filipe] copies all of the camera’s partitions over to an NFS share using the dd command. He mentions that you can also use FTP for this if you prefer. At this point, the firmware backup is completed.
Knowing how to restore the backup is just as important as knowing how to create it. [Filipe] built a simple TFTP server and copied the firmware image to it in two chunks, each less than 5MB. The final step is to tell the camera how to find the image. First you need to use the serial port to get the camera back to the U-Boot prompt. Then you configure the camera’s IP address and the TFTP server’s IP address. Finally, you copy each partition into RAM via TFTP and then copy that into flash memory. Once all five partitions are copied, your backup is safely restored and your camera can live to be hacked another day.
The tuatara is a reptile native to New Zealand, and thanks to the descendants of stowaway rats on 17th century ships, these little lizards are critically endangered. [Warren] was asked if he could film one of these hatchlings being born and pulled out a Raspberry Pi to make it happen.
[Warren] constructed a small lasercut box to house the incubating egg, but he hit a few snags figuring out how to properly focus the Raspi camera board. The original idea was to use a Nikkor macro lens, without any kind of adapter between it and the camera board. A bit of googling lead [Warren] to this tutorial for modifying the focus on the Raspi camera, giving him a good picture.
The incubator had no windows and thus no light, making an IR LED array the obvious solution to the lighting problem. Time was of the essence, so an off-the-shelf security camera provided the IR illumination. After dumping the video to his computer, [Warren] had a video of a baby tuatara hatching. You can check that out below.
Continue reading “Recording Time Lapse of Endangered Reptiles Hatching”
A Dropcam will run you about $150. Price out a Raspberry Pi, camera sensor, and a CCTV camera housing found on eBay, and it starts to look like there may be a cheaper replacement for a Dropcam sitting around on workbenches, if only someone can figure out the software. [Antoine] did just that, giving any Raspberry Pi the ability to stream H.264 video over a network.
[Antoine]’s software is based on the raspivid tool distributed from the foundation, but that only takes care of capturing and encoding H.264 video from the camera sensor. To add IP camera support, the Live555 RTSP library was mixed in and combined to stream video over the Raspi’s network connection.
What’s going on at the Hackerspace? If you can’t answer that, maybe your ‘space needs a HackerSpace Monitor. [Tayken] over at the Tokyo Hackerspace has come up with a way to remotely monitor all the stuff you’d want to know about the ‘space.
His project is based on a Raspberry Pi with a webcam connected to the Pi’s USB port by way of a hub. The webcam is set up to stream 2 frames per second, which is plenty to be able to judge the activity at the ‘space. A WiFi dongle is also plugged into the USB hub in order to gain internet access, send out the video and allow the ability to SSH into the Pi.
What if you’re on the fence about heading over to work on your favorite project but the current weather leaves you wondering what the temperature is going to be like at the hackerspace? Well, this project has that covered too. An off the shelf temperature and humidity sensor plugs directly into the Pi’s GPIO pins. [Tayken] used the Python-based package, RPi.GPIO, to manage the temperature and humidity sensor readings as well as a toggle switch that monitors if the main door is open or closed.
To get everything all the above information to be displayed on a webpage, [Tayken] had to do some fancy programming. Luckily for us, he has made all his code available for download. Not only is this a great convenience for members, but it can also show non-members when it is or isn’t a good time to show up to check the ‘space out.
One of [Sander]’s first projects with a Raspberry Pi was to get it to send messages to his iPhone. From there he decided to take it a step further and wire the tiny computer up to his doorbell, creating a system that can send push messages to his phone whenever someone is at the front door.
[Sander]’s doorbell is wireless, and he decided to keep all of its original functionality. All it took to signal the Pi was a simple circuit tied to the doorbell’s status LED which turns off whenever the doorbell is pushed.
The Raspberry Pi runs a python program that handles the GPIO pin which is wired to the doorbell. When the doorbell is pushed, the program processes and sends the push notification while taking pictures of the visitor with an attached webcam. The pictures are included in the message so [Sander] can see who is at the front door. The code for the project is included on his project page.
This project rang a bell for us since we’ve seen projects using a Raspberry Pi and push notifications. None of them so far have included a webcam or utilized an existing wireless doorbell though, and this is a great step forward!