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  1. Bryan Mayland

    Another web hosting change, any issues?

    I spent half the day today moving over hosting from the existing service in Miami to Amazon Web Services in Virginia. I think everything is back up now so if any of the heatermeter downloads don't work or the device registry isn't working, let me know and I can look into it. For those keeping...
  2. Bryan Mayland

    Raspberry Pi 4 B 2019 Support

    Today the Raspberry Pi foundation released yet another Pi B, this time they at least incremented the version number to 4! This new board has an entirely new SoC and is not supported by the HeaterMeter software. The layout changes to the design also mean it is physically incompatible with both...
  3. Bryan Mayland

    Raspberry Pi 3 Model A+ HeaterMeter Support

    The Pi Foundation has released an updated model A! It is a Pi Model 3 B+ except without the Ethernet and only one USB port 1.4GHz 64-bit quad-core ARM Cortex-A53 CPU 512MB LPDDR2 SDRAM Dual-band 802.11ac wireless LAN and Bluetooth 4.2/BLE They are currently available for $25 and again I am...
  4. Bryan Mayland

    Offtopic - Building a PID controller is easy!

    A few years back I got fed up with critters eating all my peppers in the garden so I started growing them indoors with a grow light to much success. You know I can't have anything without covering it in sensors and electronics so obviously the whole thing is now monitored and controlled within...
  5. Bryan Mayland

    HeaterMeter.com will be down Monday Oct-8

    On Monday Oct-8 2018, the server that runs heatermeter.com for the firmware downloads and images is going to be migrated from the VPS hosting in Atlanta to Miami due to the provider I use closing down that location soon. The new location means a new IPv4 address as well. We're all backed up and...
  6. Bryan Mayland

    New Tariffs Jul-6 Will Raise HeaterMeter Costs

    It's probably hard to keep up with how many protectionist tariffs are being slapped on every country and product these days, but one in particular is going to impact new HeaterMeter builds. Starting on Friday, July 6th, the US will impose a 25% tariff on electronic components manufactured in...
  7. Bryan Mayland

    Raspberry Pi 3 Model B+

    Happy Pi Day everyone! Today, the Pi foundation released a new revision of the Raspberry Pi 3. No versions of HeaterMeter support the 2018 1.4GHz Pi 3 Model B+ Physically, the design is compatible with the HeaterMeter 4.3, but there is no software support yet. I'll have to get my hands on one...
  8. Bryan Mayland

    What sort of icon represents a damper?

    I've been messing around with some UI ideas and while we can all agree what a blower or fan icon looks like, I keep struggling with what sort of icon would represent the damper's position. The biggest problem is that I am not an artist, but the other problem is that the icon needs to be easily...
  9. Bryan Mayland

    Stable Firmware Release v14

    It has been a year and a half since the v13 release (March 23, 2016) and I think we're finally ready for something new for both v4.2 and v4.3 users. The biggest feature in this release is support for the Raspberry Pi 3 and Zero W, which are compatible with the HeaterMeter 4.3 boards. This also...
  10. Bryan Mayland

    MAJOR security vulnerability in HeaterMeter firmware (dnsmasq)

    I'm sure you've all been waiting anxiously since Monday's security disclosure about dnsmasq's many Critical and Important security vulnerabilities. These are remotely exploitable issues and some allow malicious code execution. While the majority of Internet of Things devices (any smart device...
  11. Bryan Mayland

    Keyhole Holes in 4.3 Case?

    I've tried a few different ways of making some mounting holes in the 4.3 case. There's not enough room between the case bottom and Pi for fully enclosed spaces without making the case another 1mm taller just to support it. I've sort of compromised and came up with these instead. What's...
  12. Bryan Mayland

    HeaterMeter 4.3 Assembly Videos

    I've added YouTube videos to the wiki that show the entire build process of a 4.3 HeaterMeter in all boring detail. There's not much to it except staring down at a green PCB with parts going into it as I struggle to talk and solder at the same time. People have asked for it though so maybe it...
  13. Bryan Mayland

    How much 12V power is needed?

    I did some testing this morning to determine just how much power is needed in our 12V power supply. The wiki states that you need a 12V 1A supply and I'm going to agree based on me using those almost exclusively. However, some users find that their Pi reboots for no apparent reason on a 1A...
  14. Bryan Mayland

    New calculated shipping in the HeaterMeter store

    I hope this doesn't come off like an ad, Chris, and if it does please delete the thread! I've updated the HeaterMeter store to take advantage of Shopify's new calculated shipping feature, which charges actual shipping cost rather than me trying to estimate it by product. Previously I baked in...
  15. Bryan Mayland

    4.3 case option for no LCD / button holes

    I can't find the thread where we were talking about it, but I put up a new 4.3 case customizer option on Thingiverse with no LCD/button holes on the front. This is to be used without a LCD/Button board installed and no 1x5 female headers on the base board. The case isn't as small as it could...
  16. Bryan Mayland

    New v14 REST API for application developers

    Spent today getting together the framework of an actual REST API for interacting with LinkMeter from external applications. Documentation is filling out as I add functions on the wiki Accessing Raw Data Remotely. The gist is that there is now a collection of URIs /cgi-bin/luci/lm/api/* which...
  17. Bryan Mayland

    Quick PID Tuning Example

    I want to do some calibration testing sort of like how the commercial NIST calibration blocks work but first I needed a steady temperature. Just running a bench power supply at fixed current output worked ok but it takes a long time to settle at a temperature. I've built a quick test rig using a...
  18. Bryan Mayland

    Free thermocouple / base boards

    I have a couple circuit boards that are taking up space here in the lab so I'm giving them away for anyone who is building a HeaterMeter. One board per person, choose wisely! 4.3 Thermocouple base board and LCD board set - Messed up the placement on the thermocouple amp so I had to rework it...
  19. Bryan Mayland

    HeaterMeter Snapshot for RPi3 Available

    I've been working on getting OpenWrt trunk support, primarily on getting Raspberry Pi 3s fully working. I've gotten to the point where I think it is usable and stable although not yet complete. The new image is available in the HeaterMeter Snapshots directory, look for the openwrt-rpi3 files...
  20. Bryan Mayland

    HeaterMeter Hardware v4.3.3 and v4.3.4

    HeaterMeter Hardware v4.3.4 It must be really cold somewhere because I'm publishing the HeaterMeter v4.3.4 design finally. EDIT: Updated to v4.3.4 What's New Absolutely nothing! This design is just a refresh to replace obsolete components from the 4.2 design: the 4-way switch and the...

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