EWALL founded in 2012, is an electronics company for Robotics, Electrical and Mechatronic engineers and for those who zealously devoted their selves for silicone world. The Company product’s & resources are designed to make the world of electronics more accessible to inventor, students & hobbyists, and committed to bringing his customers great values in electronic components ranging from a simple chip to a complex circuitry. The company conducts R&D which is focused on optimizing and finalizing different product related to current problems and technology developments in the world. Our R&D is also working on analyzing new ideas and processes that could lead to future improvements in technology advancement and accelerating industries. EWALL is the first ever Pakistani company that is working on Multi-Rotor UAV’s Drone From high range long endurance large size Outdoor Multi-rotors to small size racing indoor multi rotors. Up to now EWALL has got a lot of achievements, some of which are Mine Predator Multi-Rotor, Dragon Eye 680 long Endurance Multi-Rotor, Night Bee Indoor Night Vision Multi Rotor, Soldier Savior Mine Detector and Security Walkthrough.
Our engineers have the skills to bring quality products to market and accomplish this by using a platform that best suits your requirements based on use, conditions, and price. As a result, you benefit from accelerated development, accumulated experience, economies of scale, and performance reliability EWALL is an electronics company dedicated to supplying our customers with quality products and services. This company is your one source for customized electronic project design and manufacturing. We provide hardware and firmware design services, prototyping, circuit verification and testing, PCB assembly, and complete box build. The strategic planning and right managerial decisions have immensely contributed towards the growth of the EWALL. The Research and Development sector is strengthened by the ultra-modern testing equipment and designing equipment which leads to the rapid development in the electronics industry in Pakistan. The vision of the EWALL is to move forward towards the assembly of electronic products and focus on knowledge-based electronics related to Embedded Systems.
We use our experience, knowledge, and expert techniques to generate cross- market solutions for defense, medical electronic devices, high-end computing, and specialty electronic products. In order to promote an inclusive, vibrant and sustainable ecosystem for R&D and innovation, EWALL is working from the past 04 years on a platform to find solutions for the growing societal need and challenges. Towards achieving these goals the R&D in Electronics have initiated various research projects in different areas of technology associated with electronics for the overall growth of this sector in the Pakistan. One of EWALL's strongest assets is our team of talented researchers and engineers. They collaborate on strategic technologies for the future and original technologies designed to forge new market trends and set new standards for excellence. The R&D of EWALL business focuses on technology that is expected to deliver the most promising long-term results. A critical way that EWALL responds to the highly uncertain business environment and the increasingly competitive marketplace is through our commitment to R&D.
Each year we invest heavy amount of our sales revenue in R&D activities. EWALL is committed to leading technology standardization.We aspire to be most preferred manufacturer of the most innovative, quality & economical products in electronics world. Our highly trained customer service representatives are available so you can get any answer for your query that comes in your mind or if you decide to make any changes to you current order. We use best courier services such as Tranzum Companies & Services that delivers all over Pakistan, ship your order safe, and secured. Call us +92 91 5253098 for your new or previous orders or if you have any question regarding our products. We will definitely fulfill all your needs at competitive prices guaranteed!Want to take your Raspberry Pi some old Lego and build a remote control Lego car? Well read on as this is the place to find out how to do it! [Note: This was my original, 2012 era blog post on my Raspberry Pi car. Read on for basic details as to how I made it.
See here for my 2013 post on how to upgrade it!] Two things have happened recently that have contributed to my tinkering hobby. Firstly - My Raspberry Pi arrived after a long (but worth it) wait. Secondly - My two girls (8 and 5) have got in to Lego and so slowly but surely I've been bringing down old Lego that I had when I was a kid, got stored in my parent's loft when I grew up and then got transferred to my loft when my parents had a general chuck out. The coolest Lego model I had when I was a kid was a the Lego 8860 car chassis. I brought this down from my loft, dusted it off and over the course of 3 weekends my daughters and I built it. Here's a picture of it after we'd finished: The only missing part that I couldn't replace was a tiny bevel sprocket from the differential. However (as I learned) there's a sites on the internet where you can buy old bits. I used this site for the missing sprocket and for some other stuff I needed (see below). The final pages of the assembly guide show how you can modify the car to add motors.
I never did this as a kid as I didn't have any Lego motors. However as an adult with a bit more disposable income and some eager children I bought a few Lego power functions motors (again from the site mentioned above). They were OK but required a battery box to be hard wired to them that meant you had to crawl along next to the car as it went along which wasn't much fun. Here's a video of the end result. I'll then tell you how we made it! We started off by looking at some simple electronics and Python code to use the GPIO to turn an LED off and on. We used this tutorial to get us started, used a breadboard, and LED and a resistor and wrote some Python code to control the LED. Here's what it looked like: So in researching motor control, the general advice was that motors require too much voltage and current to be driven directly from the Raspberry Pi. The most common advice was to use a motor controller chip and this pre-made board seemed to have everything we needed.
So I bought one! The board is based on a L298N motor controller and can be used to control a pair of motors. A pair of inputs that can be controlled by TTL logic levels (like the Raspberry Pi uses). Connections for a 9Volt battery. A pair of outputs to connect to the DC motors. The Lego power functions motors have stack-able connectors. This site describes the motors in more detail and shows the pin out for the connectors. The next challenge was making the Raspberry Pi "mobile". We already had a WiFi USB adapter for IP connectivity but the Raspberry Pi needs a) power from a 5V micro USB supply and b) a connection to a TV or monitor via HDMI or S video. To get over the power issue we bought a 5V re-chargeable battery; the sort you can get to re-charge a mobile 'phone. We bought a Powergen 5200mAh re-chargeable unit which seemed like it would do the job for this but was also small enough to fit in a pocket which might be useful for other tinkering...
We couldn't have a hulking great cable linking the Pi to a monitor so I simply installed PuTTY on my PC and enabled SSH on the Raspberry Pi via the start-up utility. PuTTY enables you to have a remote terminal session on the Pi and, by fixing the IP address on my WiFi router config. I always know which address to SSH to. The last thing to sort out was connecting the motors to the Lego car. The motor to drive the wheels was easy enough, we just removed the engine parts and inserted one of the motors (as per 1980s instructions). The steering was trickier as we needed to gear down the motor else it would just spin wildly and not have enough torque to turn the wheels. To do this we built a little Lego gearbox: From the image you can see that there's 3 pairs of small cog - medium cog pairings which gears down the motor speed nicely. It needs a bit of a tidy up but it does the job for now. So all the bits were ready, we just needed to assemble the car and write some Python code to control the motors.
Here's the car with all the kit stacked on it: The seats had to be removed but the RasPi plus battery sit nicely on one side and the motor controller and it's battery sit nicely on the other side. The first script I wrote was this: So we needed a better solution and this came from my old friend SL4A, (see previous posting). Using this we could get an Android handset to communicate with the Raspberry Pi and control the motors. SL4A gives access to all the Android sensors so we decided to use the position sensor, meaning we could tilt the handset forward and back (to make the car go forward and back) and left and right (to steer left and right). a crazy idea but it just might work! Looking at the handset side of things, we needed to learn how to detect the state of the handset sensors. This simple tutorial shows how to do it. The tutorial shows how to read all the sensors (magnometer, accelerometer, position sensor, light sensor) but I only wanted to use the position sensor.