MAX7219 serial seven segment displays for ESP8266

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Seven segment LED displays are brighter, more attractive and provide a far viewing distance as well as a wider viewing angle as compared to LCD displays. The major drawback of using seven segment LEDs is they are resource-hungry. Our MAX7219 based serial seven segment LED display modules allows you to add 8 digits of seven segment LED displays to your microcontroller project using only 3 I/O pins, and provides full control of all the digit segments including decimal points. You can even cascade two or more of these modules together without sacrificing any extra I/O pin. Since it requires only

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DIY Spectrophotometer

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Spectrophotometers are used in scientific studies to quantitatively measure the absorption spectra of a sample object by passing a beam of light through it. [doctek] is a contestant for Hackaday Prize 2016 and his entry for the contest is a DIY Spectrophotometer using Teensy. Building on some good work by others (https://publiclab.org/wiki/spectrometer andhttp://myspectral.com/ among others), this spectrophotometer has it’s own bright light (White LED), and uses a lock-in amp and photodiode as a sensitive detector. A Teensy 3.1 is used as the controller and the interface to transfer data to a pc for further analysis. The LED is a high power white

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EasyEDA releases a free, online gerber viewer

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EasyEDA is a free, cloud-based EDA application for drawing circuits, running SPICE simulations, designing PCBs, and even placing orders for fabricating PCBs. Now they have released an online Gerber viewing tool to visualize the Gerber files generated by a PCB CAD tool. The tool supports the Gerber RS-274X format, which is an industry-standard image description format for PCBs. The tool receives the Gerber files in a compressed zipped folder and performs a 2-D rendering to generate high-quality images of top and bottom sides of the PCB. The Gerber viewer also runs a simple design check in the background and displays some useful information about your PCB design, such as its dimensions,

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DIY baby monitor that streams audio over wifi using ESP8266

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This DIY baby monitor built by Sven337 uses two ESP8266 NodeMCU modules to send audio over wifi. The transmitter part consists of an inexpensive electret microphone to capture the audio in the room. The audio signal is amplified and converted to 12-bit digital samples using Microchip’s MCP3201 SPI ADC chip. The ESP8266 then reads the ADC samples through an SPI interface. The digital sound data is then sent over wifi using UDP packets to the receiving side ESP8266, where the analog audio is reconstructed using an MCP4725 12-bit I2C DAC device followed by an amplifier. The ADC needs to be audio capable

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Great Cow Basic new release announcement

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Great Cow BASIC (GCB) is a BASIC compiler for Microchip and Atmel microcontrollers. It lets you to program in BASIC instead of having to learn assembly or C language and is completely open source! The GCB team has announced the release of Great Cow BASIC v.0.95.007, which has built-in support for Microchip’s latest Xpress Evaluation board and including a host of demonstrations for this board. The Great Cow Basic development team have published another release that further enhances the Great Cow Basic compiler capabilities. The Great Cow BASIC development team have published another release that further enhances the Great Cow BASIC compiler capabilities. Support for

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