JinHua YongHeng Powder Metallurgy Co.,Ltd we are sophisticated in powder metallurgy industry for more than 22 years 2nd year with Global Sources Company Cert: ISO 9001:2008BIG BOUNDER H-Frame power chairs are configured specifically for bariatric users. They are custom built to each user's unique dimensions. The electronics and drive train are optimized at the factory for the user. Available in seat widths from 21” to 48”. Very narrow overall widths (as little as 2.5” wider than the seat width) result in improved maneuverability through doors and tight spaces. » 500 lb capacity is standard 700 lb and 1000 lb weight capacity options Seat Width: 21” to 48” Seat Depth: 12” to 23” Seat Height: 19” to 25” Back Height: 15” to 24” * Some restrictions apply Recline, tilt, seat elevate, and reverse tilt Dual independent power elevating legrests (DIPLR) Toggle switch control or through-the-joystick proportional control
ONE year warranty on entire chair 5 year warranty on Super Torque 3 Motor & Brake drive trains** 5 year H-frame base warranty 2 year H-frame seat warranty * Limited warranties - some restrictions apply. See complete warranty for more information ** Includes motors, brakes, drive wheels, drive wheel sprockets (drive belts, tires, inner tubes, flat-free inserts, motor sprockets and bearings not included) for users up to 700 lb All BIG BOUNDER H-Frame features and... » All frame members either .120” wall or solid bar stock » Solid Back posts » Cross strut welded between push handle tips or back posts » Reinforced seat mounts » Rated for a 700 lb user for users up to 1000 lb All BIG BOUNDER H-Frame Independent Drive Wheel Suspension (500 max user weight) Durable powder coated frame colors Several seat and back options, including Captains seat Many types of front rigging and arms Several styles of armrest, headrest and calf pads
Swing-away hand control extension slide Center Mount Angle Adjustable Footboard Headrests: Center post, sling and power Power seating: Tilt, recline, elevate, legrests Several front caster and drive wheel sizes Respirator shelves and O2 bottle holders Hand, chin, bib, sip-n-puff, switch and attendant controls Power chin control boom Many accessories: Lights, horn, rear view mirror, fan, electric leg bag emptier *See current order/quote forms and price lists for more information 39" Wide BIG BOUNDER with 5" Custom Seat Cushion BIG BOUNDER with Offset Front RiggingIn my first article, we used a Sabertooth 2x25 to create a functioning RC robot base. In this article, we'll configure joystick control, create a kill switch, and connect an Arduino and you can customize to your heart's content. You can use any microcontroller-compatible analog or digital sensor to send information to your microcontroller, and have the microcontroller send information to the Sabertooth to control your robot's motion.
Note that instead of the Sabertooth 2x25 motor controller we worked with in Part 1, this time we will use a Sabertooth 2x32. Average Current Per Channel25 Amps32 Amps Peak Current Per Channel50 Amps64 Amps InputsRC, Analog, TTL SerialRC, Analog, TTL Serial, USB SteeringIndependent and Mixed ModeIndependent and Mixed Mode ProgrammingUSB-Serial converter requiredMicro-USB on board Designed forEase of UseMaximum Configurability Jumper WiresVarious F/F, F/M, and M/M terminal wiresLink$10Standard DuPont connectors on multi-strand wire SabertoothDual 32A Motor ControllerLink$125 Electric WheelchairMerits P101 Folding Power ChairLink$1400 new (<$150 used)If more than $150, consider buying motors and batteries online. E-stop switchPush Down, Twist Release SwitchLink$4 Arduino Uno R3Any Arduino compatible board should workLink$15 Purchase the Sabertooth motor controller from Dimension Engineering and try to find the electric wheelchair from the local used market.
You do not need the entire chair—just the motors, wheels, batteries, and harness. If you cannot find a chair on the local used market, you can usually find the parts you need on eBay.When creating controls, make your first design consideration a way to safely bring the robot base to a stop. The preferred way to do this is with an e-stop switch. E-stops (emergency stops) are switches that typically have one normally-open and one normally-closed contact. These switches can be pushed closed, but must be twisted to reopen. Sometimes reaching a single switch on a misbehaving robot can be difficult, so you'll have to introduce other mechanical means to activate it. That might be a kick bar, or a fabric rope someone pulls or steps on. It is important to incorporate an actual e-stop switch in your design, though, because they are readily identified in case of emergencies. If you come up with an idea that is too clever or takes any amount of time at all to figure out, there is a good chance that when your robot has you pinned on the edge of a cliff with its running buzz-saw, or in another emergency situation, someone in a panic will not know how to shut it off.
The Sabertooth 2x32 is slightly larger than the Sabertooth 2x25 used in the first part of the project for a robot controller. Both controllers are excellently designed and can be user programmed with Dimension Engineering's DEScribe software. Both controllers also accept analog, RC, and TTL serial input. The changes between the two come with the advanced configurability and additional outputs of the 2x32. Along with greater current capacity, the Sabertooth 2x32 can be controlled directly by a computer or Raspberry Pi with the micro-USB connector or a combination of the previously mentioned inputs. Additionally, it can be programmed to activate the brakes on an electric wheelchair and respond to e-stops. Both options must be configured using the DEScribe software. If you can imagine a remote control robot or wheelchair design, you can likely find a way to bring it to life with the Sabertooth 2x32. For the Sabertooth to work in the mode that you want, you must set the DIP switches correctly.
Use this tool to choose the correct settings. We will reuse the joystick included in the wheelchair controller—it should be salvaged and used for future projects if you don't use it here. But note that you can create any analog or digital signal to feed into the Arduino and then interpret it for use in the Sabertooth. The headers on the wheelchair joysticks are quite small and something you might not want to work with without converting it into a larger pitch. The quickest way I found to move to a larger pitch is to simply clip the end off of the connector and crimp an RJ45 connector on the end of the wire, then from the RJ45 connector to either an RJ45 breakout or RJ45 Punchdown. The first four pins are all that are required for the easiest implementation. If you are fortunate enough to have access to a laser-cutter/engraver, I have included a simple joystick holder you can cut out of 1/8" plywood that you can use for experimenting or as a jumping off point for further design in the attached .zip.
First, here are a couple of resources that you might find useful for these next sections: Here's your checklist for connecting everything: L Brake +Bat + R Brake +Bat + Libraries and installers for Arduino can be found here. Click here for the Sabertooth "DIP switch wizard." DIP switch settings depend on the mode you wish to use. We will be starting with packetized serial mode and setting the Sabertooth to receive at address 128 Connect the Sabertooth to the computer and download settings from DEScribe software. Connect the Arduino and download the code. Raise the wheels off the ground and connect the batteries—test it out. Sabertooth Commanded by Arduino Here's a video of me testing my directional controls:Several hundred dollars and several hours later, you have now created a new Sabertooth-powered, Arduino-controlled robot via the joystick that came with it. Are you pondering what I'm pondering? Now instead of using just a joystick from an old wheelchair to control the robot, we need to get a bit more creative with our controllers: