CO2, temperature and humidity monitor

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An open source CO2 monitoring project from Roving Dynamics:

The project described below uses a MH-Z16 or MH-Z19 CO2 sensor and a DHT-22 (or DHT-11 if less accuracy is required) to measure the Temperature and Humidity. It has a 4 line by 20 character LCD Display to show the current readings and status, a warning alarm and two relays which can be triggered on a low CO2 (Generally above 1000 ppm) normally to switch on an extractor fan and a high level (4000 ppm) which will trigger a warning device such as an external alarm. There are two models I used the 0 to 5000 ppm device here but the code will be the same for the 0 to 10000 ppm model

CO2, temperature and humidity monitor – [Link]

Ultrasonic Anemometer Project Progress

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In the mean time I managed to do some rudimentary testing and now feel confident to take orders. These tests concern the hardware only. What I said last time about the state of the software still applies. But let me tell you what I’ve been able to test so far.

Ultrasonic Anemometer Project Progress – [Link]

RELATED POSTS

8 Channel Optically Isolated IO Board

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Opto-Isolated I/O Board offers a compact & convenient way to interface industrial type inputs/outputs to your microcontroller boards, Signal transmission between circuits of different potentials and impedances etc.

Specifications

  • 4 opto-isolated inputs & 4 opto-isolated outputs
  • Std TTL input signals for opto-couplers
  • Interfacing is via 10-pin Box Header and Screw terminal type connector
  • Power source LED indicator
  • Four mounting holes 3.2 mm each
  • PCB dimensions 54 mm x 64 mm

8 Channel Optically Isolated IO Board – [Link]

Ultra-low power, dual-band wireless microcontrollers from TI

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Intended for tasks such as monitoring IoT networks from a handheld device, Texas Instruments’ latest series of microcontrollers are single-chip Sub-1 GHz plus Bluetooth low energy ICs. By Graham Prophet @ www.edn-europe.com

As part of TI’s pin-to-pin and software compatible SimpleLink ultra-low power platform, the SimpleLink dual-band CC1350 wireless MCU enables developers to move from a three-chip solution to a single chip, while reducing design complexity, saving power, cost and board space. The CC1350 wireless MCU offers a range of up to 20 km on a coin cell battery for building and factory automation, alarm and security, smart grid, asset tracking and wireless sensor network applications.

Ultra-low power, dual-band wireless microcontrollers from TI – [Link]

Infinite Noise True Random Number Generator

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waywardgeek @ github.com shares his USB TRNG:

The Infinite Noise TRNG is a USB key hardware true random number generator. It uses what I call a “Modular Entropy Multiplier” architecture (previously Infinite Noise Multiplier or FireBug). Besides being simple, low-cost, and fast, it is much easier to get right than other TRNGs. It naturally defends against influence from outside signals, such as radio interference and power supply noise, making it simple to build securely, without requiring an expert in analog design.

Infinite Noise True Random Number Generator – [Link]

A20 Plus – WIFI/GPRS/GSM/CAMERA module

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Raymond Tunning shares the information he found about the new A20 modules bought from taobao.

A20 Plus – WIFI/GPRS/GSM/CAMERA module – [Link]

Tiny Lisp Computer using ATmega328

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The Tiny Lisp Computer is a self-contained computer programmed in Lisp. Some programming examples are included in the author’s website.

This article describes a self-contained computer with its own display and keyboard, based on an ATmega328, that you can program in Lisp. You can use it to run programs that interface to components such as LEDs and push-buttons via the I/O pins, read the analogue inputs, and operate external devices via the I2C and SPI interfaces. It has a small monochrome OLED display that gives 8 lines of 21 characters per line, and a miniature PS/2 keyboard

Tiny Lisp Computer using ATmega328 – [Link]

30A, PCB-level supply monitor has integrated 300 µΩ sense resistor

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>Designed to simplify board-level energy measurements, the LTC2947 power and energy monitor for 0V to 15V DC supply rails eliminates the need for an external sense resistor to measure current. by Graham Prophet @ edn-europe.com

Choosing a sense resistor, Linear says, is not an easy task, especially when dealing with high currents, where available sense resistors can dissipate too much power, occupy a lot of board space or have a large impact on measurement accuracy. The LTC2947 integrates a 300 µΩ temperature-compensated sense resistor to alleviate these concerns, providing users with a simple 24 mm² solution that provides up to 1.2% accurate energy readings at up to ±30A.

30A, PCB-level supply monitor has integrated 300 µΩ sense resistor – [Link]

7 Segment LED Based SPI Display using 74HC595

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Single Digit Big Display module using 74HC595 IC project will display large size 7 segment single digit number. 3.5inch height, which can be visible over large distance.  More digit can be connected serially to each other easily connector.

This circuit is a single digit seven segment big display using a set of 5 LEDs per segment and a shift register for easy control by micro-controller input. Each of the LEDs used in this project are 5mm high glow type.

Specifications

  • A ULN2003 IC helps sink higher current flowing through the LEDs to ground.
  • Resistor R1 to R8 are current limiting Resistors for the LEDs connected in series.
  • CN1 Connector is Data In connector
  • CN2 Connector is optional Data Out Connector if you need to stack more than 1 single display board in series
  • +V CN1 & CN2 should be connected to higher voltage to drive the LEDs
  • VCC Should be connected to 5V DC. This supply can be source from host controller
  • Each Segment made up of 5LEDs

7 Segment LED Based SPI Display using 74HC595 – [Link]