Bryan Mayland
TVWBB Hall of Fame
A year after the release of hardware v4.1, the HeaterMeter team (me!) is proud to announce the release of hardware version 4.2. v4.2 builds on the successful v4.1 platform and offers several improvements.

Information is on the wiki and everything is available on github. The OSH Park Store will be offering single v4.2.4 PCBs within the week (although they won't be in stock for about 10 days). Some of the features of the new hardware require require the latest AVR firmware 20140630B which works best with LinkMeter firmware v11.
HeaterMeter v4.2 Hardware
HeaterMeter v4.2 Assembly
HeaterMeter v4.2 LCD Preparation
Thermocouple Amplifier Testing
Thanks to all the hardware testers and 3d modelers for providing feedback, testing, and 4.2 cases which will be published soon: Ralph Trimble, Tom Kole, John Bostwick, and Matt Miller.

I also have small quantities of PCBs with the thermocouple components pre-soldered and tested available on in the HeaterMeter store for $44. A full kit of the HeaterMeter hardware is also available. I've gotten permission from the moderators to post a link to it here, thanks Chris!


- Integrated low-pass filters on all probe inputs for unparalleled temperature reporting accuracy.
- Thermocouple pit probe support - For those willing to try their hand at surface-mount soldering, the pit probe can be hardware configured to use a thermocouple. Thermocouples can survive higher temperatures (some over 1000C), react faster to temperature changes, can be cheaper, and are available in a variety of configurations. Any K-type thermocouple is supported.
- Reorganized board significantly reduces electrical noise over v4.1 and eliminates the need for "white wire" fixes and other board modifications to achieve acceptable probe performance. Completely eliminates the issue where HeaterMeter would enter lid detect mode within a few seconds of the blower turning on.
- RF input has been removed from the main board. For lmremote or IT+ reception, a secondary rfaddon board must also be built.
- Servo pulse voltage now boosted to ~4.7V (was 3.3V) which may improve drive over longer cables.
- TruVolt(tm) blower output - Integrated step-down voltage converter produces smooth voltage output for driving the blower 5V-12V rather than PWM. This provides more precise control of air flow, especially at lower output percentages.
- More compact overall design. Thinner than a cup of coffee! Wait, that's not a good comparison, but the encased v4.2 is only 29mm thick.
- Everything you do will be faster and more fun.
Information is on the wiki and everything is available on github. The OSH Park Store will be offering single v4.2.4 PCBs within the week (although they won't be in stock for about 10 days). Some of the features of the new hardware require require the latest AVR firmware 20140630B which works best with LinkMeter firmware v11.
HeaterMeter v4.2 Hardware
HeaterMeter v4.2 Assembly
HeaterMeter v4.2 LCD Preparation
Thermocouple Amplifier Testing
Thanks to all the hardware testers and 3d modelers for providing feedback, testing, and 4.2 cases which will be published soon: Ralph Trimble, Tom Kole, John Bostwick, and Matt Miller.
I also have small quantities of PCBs with the thermocouple components pre-soldered and tested available on in the HeaterMeter store for $44. A full kit of the HeaterMeter hardware is also available. I've gotten permission from the moderators to post a link to it here, thanks Chris!


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