Arduino Vacuum Gauge Display

4pBaMEP

Initial testing. Ignore the humidity sensor, that was for something else.
The vacuum gauge outputs 0-10VDC. This had to be changed to a 0-5VDC range using a potential divider so it was compatible with the Arduino. Initial build used a 10k pot in place of a vacuum gauge to make it simpler.

Arduino Vacuum Gauge Display – [Link]

Universal soldering controller

universal_soldering_controller1

sparkybg shared his universal soldering controller:

The intention was to build the most universal soldering controller I can think of. It can drive any low voltage (upto 24V) iron with thermocouple or resistive sensor, in series with the heater, or separate.
Here is a short list of features:
– power: 9-28V, AC or DC
– 2 separate heater control channels
– 2 independent sensor inputs
– current source on any sensor input 3uA – 12mA, wuth 2 bands (x1, x16) and 256 steps per band
– flexible differential amplifier input selection
– amplifier gain from 0 to 750 in 256 steps
– negative offset selection in 1024 steps
– resistive instrument identification (upto 625 different instruments can be identified by 2 resistors on the connector)
– polynomial floating point voltage/resistance to temperature calculation
– wave shaping to filter out the inductive peaks from series sensor signal
– PID control with power limit
– isolated USB port for firmware updates and live data
– 128×64 OLED display with rich user interface.

Universal soldering controller – [Link]

Affordable Opensource Arduino Laser Engraver for Everbody

blog-aufmacher

The ZelosLaser Engraver is affordable, with a compact design and the perfect entry for the Daily Hobbyist.

What are the characteristics of the ZelosLaser Engraver?

  • Work area *Normal* 300mm x 200mm
  • Housing dimensions Normal 440mm x 350mm x 220mm
  • Work area *BIG MAMA* 660mm x 650mm
  • Housing dimensions *BIG MAMA* 800mm x 800mm x 220mm

Affordable Opensource Arduino Laser Engraver for Everbody – [Link]

High-temperature versions of MEC switches now for the price of standard versions

obr1700_1

No need to consider temperature resistance of Multimec 3 and Unimec switches anymore.

Company MEC, Dutch producer of top-class push-button switches Multimec, Unimec and others comes with good news for developers and producers of electronics.

Well-known reliable push-buttons were in majority of cases available in so called standard version (L6, -40…+115°C) and in a high-temperature version (H9, -40…+160°C). From now on, all types will be gradually available only in a „high temperature“ version, which can be identified by „H9“marking in suffix. This applies to Multimec 3 and Unimec series (series Multimec 5 is already from the beginning only available in a high-temperature version).

The main „good news“ is, that these high-temperature types will be available for practically identical prices like standard types. That´s why, even in applications where you wouldn´t necessarily need that high thermal resistance, you can use this high-temp version and profit from unchanged price and potentially wider possibilities of usage of your product.

The most suitable type for you application can be easily found in the MEC catalogue (11MB).


High-temperature versions of MEC switches now for the price of standard versions – [Link]

NVE Introduces Family of World’s Smallest 2.5 Kilovolt Isolators

MSOP-V-Series

NVE Corporation has introduced 2.5 kV isolation versions of its IsoLoop® IL700-1 Series MSOP Isolators, the world’s smallest isolators. The new versions are designated with a “V-1” suffix.

With JEDEC-standard 3 millimeter by 3 millimeter MSOP-8 packages, IsoLoop® IL700-1 Series Isolators are the world’s smallest isolators. Until now they were only available with 1 kV isolation ratings.

To meet the full industry-standard 2.5 kVrms isolation specification, V-1 MSOP Isolators are 100% tested to withstand 3 kVrms, which is unprecedented for such a small part.

Other V-1 series MSOP specification highlights are:

  • One and two channels; unidirectional and bidirectional
  • 110 megabits per second
  • 2.5 kVrms isolation (1 minute) per UL 1577
  • 600 Working Voltage (line voltage) per VDE 0884-10
  • 100 teraohm minimum barrier resistance
  • -40°C to +100°C operating temperature
  • 44000 year barrier life
  • 3 millimeters creepage

NVE Introduces Family of World’s Smallest 2.5 Kilovolt Isolators – [Link]

LDMOS Transistor Bias Control in RF Power Amplifiers

LDMOS

Nowadays, laterally diffused metal oxide semiconductor (LDMOS) transistors are widely used for RF Power Amplification and in many applications. A simplified circuit of an LDMOS amplifier bias circuit is shown in the schematic diagram above. The DC Bias on these amplifiers is set by applying a DC voltage to the gate (VGS) and by monitoring the Drain current (IDD). Ideally, this IDD will be constant over temperature, but since the VGS of LDMOS amplifier devices varies with temperature, some type of temperature compensation is required.

The ISL21400 features a precision voltage reference combined with a temperature sensor whose output voltage varies linearly with temperature. The precision 1.20V reference has a very low temperature coefficient, and its output voltage is scaled by an internal DAC (VREF) to produce a temperature stable output voltage that is programmable from 0V to 1.20V. The output voltage from the temperature sensor (VTS) is summed with VREF to produce a temperature dependent output voltage. The maximum voltage supply of the ISL21400 is 5.5V, and the LP2950 voltage regulator drops the LDMOS voltage to 5.5V for the ISL21400 supply. An LC filter is then added to the output of the voltage regulator to ensure no RF energy present on the supply line. The ISL21400 can be tied to a microcontroller or to any I/O connector for PC control and programming.

The RFPA bias control using the ISL21400 is very straightforward. The RFPA uses the Freescale AFT21S140W02GSR3. LDMOS are useful devices for many applications including commercial FM broadcasting and TV power transmitters, cellular and paging communication systems, and military RF and microwave hand-held transceivers.

LDMOS Transistor Bias Control in RF Power Amplifiers – [Link]

Cypress Introduces the Industry’s First 4Mb Serial F-RAM

FRAM_2

New F-RAM™ Expands the Density Range of the Most Energy-Efficient Nonvolatile RAMs for Mission-Critical Data Storage.

Cypress Semiconductor introduced a family of 4 Mb serial Ferroelectric Random Access Memories (F-RAMs™), which are the industry’s highest density serial F-RAMs. The 4Mb serial F-RAMs feature a 40-Mhz Serial Peripheral Interface (SPI), a 2.0 V to 3.6 V operating voltage range and are available in industry-standard, RoHS-compliant package options. All Cypress F-RAMs provide 100-trillion read/write cycle endurance with 10-year data retention at 85 °C and 151 years at 65 °C.

Cypress F-RAMs are ideal solutions for applications requiring continuous and frequent high-speed reading and writing of data with absolute data security. The 4 Mb serial F-RAM family addresses mission-critical applications such as industrial controls and automation, industrial metering, multifunction printers, test and measurement equipment and medical wearables.

Cypress Introduces the Industry’s First 4Mb Serial F-RAM – [Link]

ESP8266 Breadboard adapter

ESP-Breakout-600x399

Baoshi of DigitalMe wrote an article detailing his ESP8266 (ESP-07/12) Full I/O Breadboard adapter, that is available at Github:

The rise of the ESP8266 WiFi chip was almost overnight with Espressif’s open approach and pushing from Hackaday. While no ground-breaking product has yet emerged, the development on the chip are phenomenon. However due to an unknown reason the ESP8266 modules manufacture seems to prefer non-standard 2.0mm pitch connector, which gives a lot of headache to breadboarding lovers like me. This forced me to make a breadboard friendly ESP8266 breakout board.
The modules I’m targeting are ESP-07 and ESP-12, both having identical pinout but only differ in antenna type. I choose these two because they have all the I/O available, and using same edge castellation (half vias) connectors which is easy to work with.

ESP8266 Breadboard adapter – [Link]

Interfacing PIR sensor to 8051 microcontroller

interfacing-PIR-sensor-to-8051

Praveen from CircuitsToday has written up an article on interfacing PIR sensor to 8051 microcontroller:

PIR sensors are widely used in motion detecting devices. This article is about interfacing a PIR sensor to 8051 microcontroller. A practical intruder alarm system using PIR sensor and 8051 microcontroller is also included at the end of this article. Before going in to the core of the article, let’s have a look at the PIR sensor and its working.

Interfacing PIR sensor to 8051 microcontroller – [Link]

Samsung Announces Their Entry into the Arduino Family

SamsungARTIK

by Matt Stultz @ makezine.com:

When you think about Samsung, the first products that come to mind are probably phones or televisions, not Maker-focused electronics. Today, with their announcement at Internet of Things World, Samsung has entered the Maker world with their ARTIK platform, an Arduino compatible family of devices targeted towards Internet of Things applications.

Currently there are three ARTIK devices: The ARTIK 1, ARTIK 5, and ARTIK 10. All are multi-core ARM processors with built in Bluetooth Low Energy. The ARTIK 5 and 10 also include Wi-Fi, BT, Zigbee, and Thread wireless connections.

Samsung Announces Their Entry into the Arduino Family – [Link]