Beagle Board – Create Open Embedded Devices

The Beagle Board is a low-cost, fan-less single-board computer based on Texas Instruments OMAP35x processors featuring the ARM Cortex-A8 core.

Beagle Board – Create Open Embedded Devices

The USB-powered Beagle Board is a low-cost, fan-less single board computer that unleashes laptop-like performance and expandability without the bulk, expense, or noise of typical desktop machines.

BeagleBone Black – Boot Linux in under 10 seconds and get started on development in less than 5 minutes with just a single USB cable.

BeagleBone Black

OMAP3530 processor highlights:

Over 1,200 Dhrystone MIPS using the superscalar ARM Cortex-A8 with highly accurate branch prediction and 256KB L2 cache running at up to 600MHz. HD video capable TMS320C64x+ DSP for versatile signal processing at up to 430MHz.

Buy a BeagleBoard at Digikey

Some Projects on BB

beaglelab – BeagleLAB is an Embedded Developer’s Workbench

BeagleBot – Beagle powered robot – A small experimental robot with Beagle Board as it’s heart.

Mixed Circuits Analog with Digital

Mixed Circuits Analog with Digital

Here are some circuits that have both Analog and Digital Signals in them. At one time i wanted to make reed relays, it was a good spot to be in, as it was used in Telecommunications. Even Small Office EPABX systems would have quite a Few of them. It was Simple, get some reeds from OKI and wrap them up in some copper coil and Pot them in a plastic can with epoxy. Before i could get even some trials out, the market was flooded with Good Quality Reed Relays from many.

So the Lesson, “Time to Market” should be minimum without sacrificing Quality. That brings us to another metric, The TTM/Q Ratio ;-) . This should not be mixed up with “Time to Exhibition or Trade Show”.

Fluid or Water Level with Reed Relays

“Reed Relay. It was invented by Dr. W. B. Ellwood at Bell Labs in 1936. Contacts are in a sealed glass tube filled with inert gas like in a bulb, so they do not corrode. It is faster than regular relays and as no spring is used it has a longer mechanical life. The two contacts are ferromagnetic blades plated with rhodium. When you take a magnet close by, the contacts touch each other. You can also put the reed in a coil, then when you energize the coil the reed operates. Used in telecommunication.OKI is one manufacturer of this type of component. “

Some Circuits on above pages are..

  • Voltage to pulse converter using opamps
  • Analog Section of 8751 based flowmeter
  • Voltage to pulse converter impulse counter
  • 16 channel analog multiplexer
  • 8 channel analog mux with sample hold
  • Digital Control for 8 channel analog mux

Instrumentation and Measurement Circuits

Instrumentation and Measurement Circuits

T&M and Process Control Instrumentation have many things in common; but the conditions in which a Industrial Instrument works, may be very unfriendly.

Industrial Instruments are used both in Clean-Cool Control Rooms and also in a corrosive, humid, hot and vibrating industrial environment. Even high levels of Static, Magnetic influences in conjunction with spikes and brown outs can be expected.

Test and Measurement instruments are of two types, by way of its usage; Portable and Benchtop. Portable Instruments will consume low power, insulated and rugged. The Product Safety features are more stringent as they are HandHeld or slung over the shoulder. Some features and specs are sacrificed. The Benchtop version has more front panel space and can interface with other instruments or systems. More accuracy and features can be accommodated in this.

Basic Measurement

Other Circuits on this page are – in PDF

Simple MilliVolt Source, 0-2V to 4-20mA Converter, Analog averaging circuit with Opamps.

Electric double layer capacitor an eFlywheel

The Electric double layer capacitor has the main use of a Charge Reservoir. That means a large amount of electrical charge in a small footprint.

These charge/discharge quickly unlike the battery, There is no Electrical Energy to Chemical Energy Transformation and back, like in batteries. It may need caution in design and usage as they may carry a lot of punch.

Also known as Ultracap, Goldcap, Supercap – Electric double layer capacitor, In Farads, like batteries, Energy Reservoirs or eFlywheel.

In Product Safety terms; The Battery has a Internal Resistance, but a Supercap does not. When used in Values like 100F and is fully charged, an Internal or External Breakdown of Insulation or Short Circuit may Occur. The Heat Generated is Enormous. Murphy’s Law says such things happen..

Supercap at Wikipedia

Electric Double Layer Capacitor (EDLC) or SuperCapacitor

DLCAP – Electric Double Layer Capacitor – Nippon

They have a range of Supercapacitors upto 2500F at 2.5V and Modules like 400F and 15V. There are two types Prismatic and Cylindrical. In comparison to batteries – multi-million cycles of charge-discharge is possible.

EverCAP – Double Layer Capacitors – Nichicon

They have two types, High Power Density for a large current discharge. High Energy Density for a long backup time. Over a million Charge/Discharge cycles. High Efficiency. Capable of fully discharging to zero volts.

Some things to note for a design engineer. The EDLC or Electric Double Layer Capacitors …

  • Specified Endurance and end of life.
  • Excess Vibration can alter Specs.
  • Caution – The maximum temperature.
  • Specs are dependent on Temperature.
  • Maintain Low ripple current on Charge/Discharge.
  • It is Polarized like a Electrolytic cap.
  • Not Hot parts or Heatsink near cap.

The Double Layer Capacitors developed by WIMA are storage capacitors with highest capacitance values in the Farad range.

GTO Capacitors – WIMA

They are among others suited to serve as batteries, can deliver considerably higher currents for a short time, however, and are maintenance free.

SuperCapacitors – WIMA

These EDLC supercap has one-tenth of energy, but delivers over 10 times of power due to ultra low ESR. In Comparison with a Battery. A Lifetime of over 500,000 cycles.

Xelled Supercapacitor – Vinatech

Some Specs

  • Rating 2.5V / 2.7V
  • High power density (low internal resistance)
  • High electrical current, instant power back-up applied

Read more about Supercapacitors.