This application note describes how to implement RS-485 communication with NXP i.MX RT series EVK, and how to design software based on NXP MCUXpresso SDK. For high-speed RS-485 bus, normally the baud rate is up to 5 Mbps; the interrupt and software polling mode is not practical in such a scenario. DMA and other mechanisms must be adopted based on SDK API.
bdring writes, “My Atari 1020 Pen Plotter retrofit project is done. My project for the month of October (#inktober) was to convert a 35 year old Atari 1020 to Grbl_ESP32 control. My goal was to not change, modify or add any parts other than the controller. “
This project will show you how to create a fully automated ground station that will receive and decode NOAA weather satellite images and upload them to your own website served from an Amazon AWS S3 bucket. With this project you don’t need your own server or have to run your own website infrastructure. Have a look at my AWS site that is updated automatically all day long.
For a while a wanted to make my own flight recorder similar to the commercial altimeters but with my own requirements for functionality. In addition it needed to be visually appealing and functional in the same time … After some thinking about the design and functionality the idea for the MINI FLIGHT RECORDER was developed in my mind and I set myself to work.
Base station uses an Arduino Pro Mini 5V. The reason for having 5V in this circuit is the TM1637 7-segment display. We’re using a 5V active buzzer module, two wires – signal and ground. On the left are the Adafruit PowerBoost 1000C for 5V and the green Pololu switch mode voltage regulator board for 3.3V for the radio module. The Base Station runs for ~5 hours off a 2000 mAh LiPo battery.
About a month ago, I showed you how to create a USB power hub using a DC power adaptor like this. One of the suggestions was to use USB type C as the power source and in this post, we will learn how to do just that.
Every Tuesday we give away two coupons for the free PCB drawer viaTwitter. This post was announced on Twitter, and in 24 hours we’ll send coupon codes to two random retweeters. Don’t forget there’s free PCBs three times a every week:
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Tweet-a-PCB Tuesday. Follow us and get boards in 144 characters or less
Facebook PCB Friday. Free PCBs will be your friend for the weekend
Liviu writes, “Recently I was made aware of the fidget cube. However the cube doesen’t seems to do anything so as a request from somebody, I decided to modify a bluetooth VR box controller and insert it in a cube.”
App note from ON Semiconductor on their Smart Fuel gauge LC709204F. Link here (PDF)
LC709204F is a Fuel Gauge for 1−Cell Lithium−ion/ Polymer batteries. It is a part of our Smart LiB Gauge family of Fuel Gauges which measure the battery RSOC (Relative State Of Charge) using its unique algorithm called HG−CVR2. The HG−CVR2 algorithm provides accurate RSOC information even under unstable conditions (e.g. changes of battery; temperature, loading, aging and self−discharge).
In a previous post I described a simple circuit that provided a low-voltage cut-out that could be used in a battery-operated system – see the article “A latching low-voltage disconnect for 12 volt lead-acid and lithium batteries”. That circuit – intended mostly for lithium-based batteries – required manual intervention to “reset” the device, intended for those situations where you wanted to provide manual intervention in resetting the circuit to prevent causing harm to the battery – and maybe the gear connected to it. This circuit is different from that described in the link above, intended mostly for lead-acid based systems where an automatic reconnect of the battery is required upon application of charge current.
The MiniTiouner uses free to download DVB-S receive and analysis software called “Minitioune” written by F6DZP. The Software is hosted on the VivaDATV forum. So I registered and downloaded the software.
is complete enough to start testing on real hardware. This update puts
almost every feature under control of the state machine in the FPGA so
commands can be pipelined with repeatable precision. Commands
(write/read SPI, set/clear pin, measure voltage, update PWM, enable
pull-up resistors, etc) are pushed into a FIFO buffer using a 17bit
command/data protocol inspired by the interface of ST7789-based LCDs.
When the state machine is enabled the commands are processed in one
Recently, I have been designing some SMPS and required some hardware to measure the actual loop response of the complete converters. People familiar with this area will probably know this can be done breaking the feedback loop of the converter and injecting a small AC signal and measuring the loop response at the output of the converter. However, such a measurement requires a mechanism to inject this signal differential across a small resistor inline with the normal feedback network. Unfortunately, as most signal generators are ground referenced we need special hardware to convert this output to a floating output.
DuWayne KV4QB, has done a Step Attenuator project and was kind enough to give me a board he designed for it at FDIM this year. So, I will not reinvent the wheel here and follow his design. Thank you DuWayne. Here’s a link to his blog where you can read not only about his attenuator project but other great things he has done. kv4qb.blogspot.com As is with DuWayne’s project, I’ll use 2 pe4302 boards connected in series with the control lines in parallel. This will mean that the attenuator steps will be in 1dB increments which is fine for anything I’ll require. Max power input is +24dbm which is again fine for my purposes.
The DPS5005 is a DC-DC converter. It can accept an input voltage from 0 to about 55 volts or so, and will regulate an output voltage up to about 1 volt below the input. This version is good to 5 amps, but there are other versions of this supply that will do as little as 30V / 2A and as much as 50V / 20A. 50V 5A seems like a good sweet spot. Since it is a DC-DC converter, you have to have a DC source to drive it. A lot of people use a 48V power brick, as they are commonly available.
Brushless electric motor (BLDC motors) are synchronous motors that are powered by a DC electric source via an integrated inverter/switching power supply, which produces an AC electric signal to drive the motor.
NXP’s app note about the internals and how to’s footprint design and solder their leadless dual and quad flat packages. Link here (PDF)
The small outline no-lead (SON)/quad flat no-lead (QFN) is a small size, lead-less plastic package with a low profile, moderate thermal dissipation, and good electrical performance. It is a surface mount package with metallized terminal pads located at the bottom surface of the package. SON have terminal pads along two opposite edges of the package versus QFN with terminal pads along the four edges of the bottom surface. SON is sometimes also referred as DFN: Dual flat no-lead package.