![]() I think I’d add a legit battery fuel monitor (I use a voltage monitoring chip right now, that goes HIGH when the batt voltage falls below 3.5V). Maybe I’d use a combination of a low power LCD 7 segment display (for time) with a 4.5 inch eInk screen.Ĭ. Or maybe I’d add a crystal to the ESP32 and use internal RTC (which is super inaccurate w/o an RTC).ī. I might use a NE555 to send a 1 HZ pulse to the display, and use a different RTC- as long as it was low cost, low power, and supported multiple alarms/timers. I’ll add a comment below with links to all the software (device and server side) and hardware designs.Ī. That being said… $92 is a lot of money… so I’m all for people building their own – or better yet, building a better version. That – plus the need to use Crowd Supply as a selling channel – is why the units are $92 (they were cheaper at the launch date). – Works “out of the box” software that includes a bunch of stuff – Battery charging circuitry (with a low batt indicator) Adafruit provides only the display for $45 (which I purchased and used for early prototyping). You’re right – the Sharp displays are expensive. – Interrupt pin supports three alarms that can be used at the same time – Periodic (changes the time every min, countdown timer – used for the regular and Pomodoro timer, and alarm)Ģ. – clock out pin is used to send a 1HZ pulse to the display (so there is no screen burn in) – an RTC that provided a separate clock out pin and interrupt pin I chose the RV-3028-C& RTC because I needed I also designed and built this during the chip shortage, which impacted certain decisions.ġ. I thought a lot about the components that went into the NEWT. ![]() DS3231X Extremely Accurate I☬-Integrated TCXO RTC Adafruit SHARP Memory Display Breakout – 2.7″ 400×240 Monochrome $44.95Ĥ. Unfortunately the DS3231S costs around ten bucks a-pop and are very difficult to find these days. I would prefer it had a Dallas/Maxim/ADI DS3231S Extremely Accurate I☬-Integrated TCXO RTC instead. But that’s probably OK if it’s indoors and sets itself via SNTP a couple of times a day. It uses a Micro Crystal AG (SWATCH Group) RV-3028-C7 RTC module, which is run-of-the mill stability-wise (☑ppm 25☌). But $92.00 – really? I have a couple more nit-picks: A. For example Adafruit sells it for $44.49. I know that Sharp/Kyocera 2.7″ Memory-In-Pixel (MIP) display is expensive. Available now at Mouser for USD $92.00 each plus shipping. Posted in clock hacks, News Tagged calendar, clock, lcd, wall monted, weather clock Post navigation We hope to see more applications that can combine the best ideas of both worlds of the e-paper application devices and devices using LCDs, while still being open source and hacker friendly. We’ve seen many other great wall mounted projects that use E-Ink displays as well as many projects that take advantage of the high refresh rate and low power consumption of LCD screens. ![]() Everything is open source software and open source hardware, including certification, so the enterprising hacker could point the services to anything desired or extend the Newt with their own communication protocol and functionality. The different pieces of functionality that take in outside data are brokered through MQTT API services coded into the device. A 1.85Wh LiPo battery (3.7V, 500mAh) is claimed to last for 1-2 months, with the possibility of using a larger battery for longer life. The Newt is WiFi capable through its ESP32-S2-WROVER module with a RV-3028-C7 Real Time Clock, a buzzer for sound feedback and capacitive touch sensors for input and interaction. The display itself is a 2.7 inch 240×400 SHARP “Memory In Pixel” LCD that provides the peppy display at low power. ![]() The Newt uses an LCD screen that, while not being as low power as an E-Ink display, offers extended battery operation while still being daylight readable and providing high refresh rates. Many of the battery powered devices of this sort use E-Ink displays which offer long operating windows but poor refresh rates. The Newt tries to strike a balance between providing long operating periods while still maintaining high refresh rates and having extensive features. Creates a battery powered mountable display, called “the Newt”, that can be used to display information about the time, calendar, weather or a host of other customizable items. ![]()
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