Tag Archives: Digital

Wireless digital scale

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This is a wireless digital scale using ATTiny85 microcontroller and HM-10 Bluetooth low energy transmitter/receiver:

This scale is wireless. It may be useful where you can’t operate a normal scale, due to the weather outside, or if you don’t want to scare birds or other creatures away. With this scale you can weigh them. In this instructable, I used a 0 to 1 Kg load cell since I wanted to weigh hummingbirds and orioles that visited our nectar feeder.

Wireless digital scale – [Link]

PIC16F628A Programmable Digital Timer

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Raj Bhatt shared another project with us. This time is a programmable digital timer with relay switch based on PIC16F628A.

Programmable relays find use in numerous automation applications such as automatic street light control, watering and pump control, HVAC, home automation, power plants automation in industries, etc. This article describes how to build a fully functional, one-channel programmable relay switch using the PIC16F628A microcontroller. It allows you to set both ON and OFF time. The maximum time interval that you can set for on and off operations is 99 hours and 59 minutes. Another interesting feature of this project is it offers cyclic option, which means you can choose to run it in a continuous loop of ON and OFF cycles. The device can be programmed through 4 push switches. The programming menu and device status are displayed on a 16×2 character LCD. The timing resolution of this relay timer is 1 minute. The timer also saves the user inputs to its internal EEPROM so that it can retain these values after any power supply interrupt.

PIC16F628A Programmable Digital Timer – [Link]

Oscilloscope tips and tricks

image: sparkfun.com
image: sparkfun.com

Arthur Pini has compiled a list of tips and tricks for use on digital oscilloscopes. The article is separated on 3 parts. The first is “10 Tricks that extend oscilloscope usefulness” the second is “10 More tricks to extend oscilloscope usefulness” and the third on the link below.

Modern digital oscilloscopes have a great many features that are not apparent to the casual user. By using these “hidden” features, you can save time and get the results you need to get the job done. This is the third installment of useful hints for extending the effectiveness of your digital oscilloscope.

Oscilloscope tips and tricks – [Link]

Generating Analog Voltage with Digital Circuit

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Maurizio show us how to generate an analog voltage using a microcontroller and some resistors.

The purpose of this article is how to generate analog voltage with digital circuit. Although the market provides today a very broad range of dedicated digital-to-analogue converters, putting such a device in the schematic has a negative impact on the overall cost of the system. There are however, cheap methods of creating the required voltage levels, and even of generating pseudo-analogue signals, using purely digital means.

Generating Analog Voltage with Digital Circuit – [Link]

ARC Digital Amplifier

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Enjoy high-end sound quality for all your music with this small and modern digital amplifier.

The ARC was made to bridge the gap between high-end sound quality and the world of digital music. Designed as the perfect receiver and amplifier, this ultra-compact unit provides high-resolution USB audio streaming capabilities, high quality aptX Bluetooth audio and astonishingly detailed sound. For a great listening experience and immersive sound, all you need is a set of speakers and the ARC. Done.

ARC Digital Amplifier – [Link]

Digitally controlled bench PSU

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Bertho posted a digitally controlled PSU design in the forum. He writes:

The design is for 0…30V and 0…3A (90W) controllable at ~1mV and ~0.1mA steps. The actual accuracy is still out for testing and I assume that noise and non-linearity will be a factor to look at when time comes. The basic design allows for 0…42V (max 45V) and (at least) 0…4A, but then all the components should be re-calculated to match such setup. Also, some components need to be voltage matched for a higher input voltage.
The design is a dual control-loop where the first stage is a switching PSU which is fed back to assure a 2.5V drop over the secondary analog control stage. The secondary stage is also responsible for the current limiter. The idea here is to reduce the power loss in the BJT (Q4) in the analog stage.

[via]

Digitally controlled bench PSU – [Link]

rLogic: Affordable, Tiny, Universal Logic

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Watch signals propagate through basic digital circuits. Emulate any two-input logic gate using just one rLogic board and one jumper. To order rLogic+, the breadboard compatible variant, simply order normal rLogic. When the survey is sent out you will indicate which you would like.

rLogic is a basic breakout board for the Fairchild Semiconductor TinyLogic® series of Configurable Logic Gates, with an LED for watching signals and cleverly arranged header pins for simple conversion from gate to gate. Different from programmable logic, configurable logic is manually changed through rewiring using a simple shunt (AKA, a jumper), allowing you to easily and quickly morph a single pinkie sized board into any basic logic function you might need. rLogic requires no prior knowledge, but if knowledgeable of basic digital circuitry then you may jump right in with creating. If not, then a few minutes with rLogic boards will begin to teach you the basics of digital electronics.

rLogic: Affordable, Tiny, Universal Logic – [Link]

Open Education: An Introduction To Digital Electronics

[San Francisco, CA] – Amidst the countless universities and schools raising tuition rates and cost of education, one man is stepping outside the norm and providing classes on electrical engineering completely free of charge: No ads; no memberships; just free education.

Christopher Peurifoy, a Masters of Electrical Engineering graduate from California State University: Chico and creator of the electronics website pyroelectro.com, wants to share his wealth of knowledge with anyone with an Internet connection and the desire to learn. The only obstacle in his way is the cost of funding such an undertaking. Continue reading Open Education: An Introduction To Digital Electronics

Understanding and interpreting logic IC datasheets

This app note from Texas Instruments focuses on understanding and interpreting datasheets for logic ICs. [via]

To assist component and system-design engineers in selecting Texas Instruments (TI) standard-logic products, this application report is a synopsis of the information available from a typical TI data sheet. Information includes a brief description of terms, definitions, and testing procedures currently used for commercial and military specifications. Symbols, terms, and definitions generally are in accordance with those currently agreed upon by the JEDEC Solid State Technology Association for use in the USA and by the International Electrotechnical Commission (IEC) for international use.

Understanding and interpreting logic IC datasheets – [Link]