uncleflo
Registered since September 28th, 2017
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RP2040 Launches Rocket Flight Computer | Tom's Hardware
Saved by uncleflo on January 27th, 2022.
Putting Raspberry Pi boards into space is nothing new, but the method of achieving orbit often differs. While the Astro Pi computers headed for the final frontier onboard a SpaceX Falcon 9 rocket, there are some decidedly lower-tech approaches including, as detailed on the Tindie blog, this $45 RP2040 flight computer from Finnish designer Dan Invents. Combining the RP2040 controller with an altimeter, accelerometer, temperature sensor, and enough juice to power two servo motors (for parachute deployment on the way down), the Rockit (rocket operation computing kit) weighs just 0.18oz (5g) and measures 1.73 x 0.9 x 0.35 inches (44 x 22 x 9 mm). It comes with an open-source firmware pre-installed, and can be tinkered with and updated over micro USB. There's a 16-position rotary switch for adjusting parameters such as start and end positions for the servos, and also a buzzer, so you can more easily find your rocket after a successful landing. Compared to the 2MHz Apollo guidance computer that deposited Neil Armstrong on the Moon, the RP2040 is a powerhouse, and should be more than capable of altitude-based parachute opening and logging flight data from the sensors to a micro SD card. The kit, which costs $44.99, comes with just the board and its pin headers - you need to supply your own battery, servos, cabling, micro SD card and space suit.
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PDF - Four or more layer PCB design for beginners using EAGLE
Saved by uncleflo on June 23rd, 2019.
With microcontrollers and other Integrated Circuit (IC)’s getting smaller and smaller Printed Circuit Board (PCB) design gets more and more difficult. 2 layer PCB design is getting common for small companies and hobbyists but 4 layer or more is a bit daring for those used to 2 layers. When designing a circuit with a Ball Grid Array (BGA) that has 100 or more pins a 4 layer circuit board is necessary, but more layers can make designing easier. With prices of 4 layer boards getting lower it can be a better idea to route a board thats hard to do in 2 layers in 4 layers as it can save a lot of time. This document will explain the basics of routing PCBs with 4 or more layers with Cadsoft Eagle.
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A Revolution for Hydropower | Turbulent
Saved by uncleflo on January 18th, 2019.
We develop efficient hydropower plants for rivers and canals with a low height difference (between 1.5 - 3.5m), thanks to new technology based on the vortex principle. We generate electricity using an individual turbine or a network of multiple turbines, all designed for durability and low maintenance. Resilient, efficient turbines designed for rivers with minimal height differences. Explore.
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6 Stage Ultra Violet Reverse Osmosis water filter system (WL)
Saved by uncleflo on January 4th, 2019.
Six stage Reverse osmosis water filter system. Reverse Osmosis: The ultimate in water filtration Crystal clear pure refreshing water on tap. Using a Six stage water filtration system the EMWC reverse osmosis delivers unrivalled quality in water filtration. 1st Stage water filter 5 micron Polypropylene filter (life Span 6 months Approx). Removes all particles above 5 micron from the water supply this includes metals and general water sediment. 2nd Stage carbon water filter (life Span 6 months Approx). Removes, Herbicides, Pesticides, Trihalomethanes, Chlorine, Organic Chemcals, lead and aluminium. 3rd Stage 1 Micron Polypropylene water filter (life Span 6 months Approx). Removes all particles above 1 micron from the water supply this includes any remaining water sediment. 4th stage Membrane 50 gpd (life Span 18 months Approx). The membrane creates the finest filtration, the treated water is forced through the membrane and any un-pure water is discarded this is generally around 75 – 80% allowing through just pure filtered ater to enter the pressurised holding tank. 5th Stage In Line Activated Carbon water Filter (life Span 6 months Approx). Once the faucet is opened the water goes through a final carbon water filter that effectively polishes the water prior to your consumption. Six Stage Ultra Violet Filtration. our UV systems employ a low pressure mercury vapour discharge lamp surronded by a water jacket whose inner wall is made from a special UVC-transparent quartz material. The Lamp Produces a very strong spectral line at 254nm in the shortwave region, which is the waveband most lethal to micro organisms. The UV light shines powerfully through water passing along the unit. Destroying the cell DNA (or RNA in the case of viruses) making the micro organisms inactive. We use a stainless steel water chamber maximising full use of the available ultra-Violet energy, resulting in long exposure times and high doses and minimising UV light absorption into the chamber wall.
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Microcontrollers Motor Control and Drive
Saved by uncleflo on July 15th, 2014.
Shorten your development cycle using free motor control software with application notes and tuning guides. Scalable motor control development tools promote rapid prototyping for low and high voltage systems including dual motor control options. PIC microcontrollers and dsPIC controllers contain innovative motor control PWM peripherals including complimentary waveforms and dedicated time-base. For applications that require variable speed with constant torque and field oriented control for greater efficiency, the high performance dsPIC core includes DSP instructions for more precise control.
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Brushless DC (BLDC) motor with Arduino – Part 2. Circuit and Software
Saved by uncleflo on July 15th, 2014.
In this post I will describe the hardware and the software part of a project involving the use of BLDC (Brushless DC) motor salvaged from a broken XBox 360. This is a second installment in the series of posts related to Arduino and brushless DC motors. Please see the first part for a bit of info on the theory behind the commutation sequence. Once you understand the commutation sequence for the particular design of the BLDC motor, the circuit design for the BLDC driver becomes pretty clear. It is not much different from a bipolar stepper driver in that we need the be able to both source and sink current at all ends of the windings, except of course in this case there are only three ends whereas the bipolar stepper has four.
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Using an RTOS on Cortex Based Microcontrollers
Saved by uncleflo on February 2nd, 2014.
This course is an introduction to using a small footprint Real Time Operating System on a Cortex-M based microcontroller. Throughout the course we use the CMSIS-RTOS API which is designed to be a standard software interface for operating systems running on Cortex-M microcontrollers. The course is designed as a hands on workshop using the Keil MDK-ARM development software.
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ARM Cortex microcontroller workshop
Saved by uncleflo on February 2nd, 2014.
Hitex is holding a series of one-day workshops to introduce the ARM Cortex microcontroller. During the workshop, you will learn about the features of the Cortex-M0 and Cortex-M3 microcontroller architecture, along with programming methods to best take advantage of them.The workshop will be held on the following dates at Hitex offices in Coventry
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COMMStellation™ - MSCI
Saved by uncleflo on September 15th, 2013.
COMMStellation™COMMStellation™ is our communications constellation that is being developed to help alleviate global backhaul issues and connect rural and remote areas of the world where fibre infrastructure is cost prohibitive. COMMStellation™ is scheduled for launch in 2018. MSCI’s COMMStellation™ will orbit the earth at a height of 1,000 kilometres circling the earth in a polar orientation. COMMStellation™ will be comprised of 72 microsatellites in 6 orbital planes with an additional 12 redundant microsatellites (2 per orbital plane). In its current configuration, COMMStellation™ will provide 100% global coverage with up to 15 times the speed and 10 times the total bandwidth capacity of a MEO constellation of comparable satellites.
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Tiny Core Linux, Micro Core Linux, 12MB Linux GUI Desktop, Live, Frugal, Extendable
Saved by uncleflo on January 3rd, 2013.
The Core Project is a highly modular based system with community build extensions. It starts with a recent Linux kernel, vmlinuz 3.0, and a 5MB core.gz. MicroCore 8MB is simply the kernel + core.gz - this is the foundation for user created desktops, servers, or appliances. TinyCore is simply the kernel + core.gz + Xvesa.tcz|Xorg.tcz + Xprogs +fltk-1.10.tcz + (user's choice of Window Manager) + wbar.tcz TinyCore becomes simply an example of what the Core Project can produce, an 12MB FLTK/FLWM desktop. CorePlus ofers a simple way to get started using the Core philosophy with its included community packaged extensions enabling easy embedded frugal or pendrive installation of the user's choice of supported desktop, while maintaining the Core principal of mounted extensions with full package management. It is not a complete desktop nor is all hardware completely supported. It represents only the core needed to boot into a very minimal X desktop typically with wired internet access.
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