Add Battery Coin Cell Holder on PCB

[K7MDL2]

Suggestion to add a vertical coin cell holder to the PCB layout for the Teensy onboard RTC. Not required for keyer use but if a display is added later, other features can leverage time, or just be useful for hand logging while in the field - microwave, SOTA, POTA operations for example.

[softerhardware]

Can you suggest some preferred part numbers and/or footprints?

[K7MDL2]

Sure. A 3V cell such as a CR2032 is common and in fact what I am using on my Teensy 4 projects. Also common to many DS1307 modules and GPSDOs. I prefer vertical holders to keep the PCB more compact. There are far more horizonal mounts available if you have room and fitting into a low profile enclosure. [1074] 1074 Keystone Electronics | Battery Products | DigiKey<https://www.digikey.com/en/products/detail/keystone-electronics/1074/9921784> Digikey # 36-1074-ND Keystone #1074 0.4615 Qty 100. http://www.keystoneelectronics.net/ENG._DEPT/WEB_ORACLE/PDF/PDF CAT NO DRAWINGS/1000-1999/1074.PDF<http://www.keystoneelectronics.net/ENG._DEPT/WEB_ORACLE/PDF/PDF%20CAT%20NO%20DRAWINGS/1000-1999/1074.PDF> I use ethernet with my projects so have a NTP time and the RTC keeps the time when powered off. A neat feature of the Teensyduino loader will, by default, automatically update the onboard clock via the USB connection when you program the Teensy. I let it do that then if NTP is successful, update the time overwriting the PC update. You can choose whether to allow the PC update or not. Mike K7MDL EL87sm & CN88sf From: Steve Haynal ***@***.***> Sent: Friday, October 29, 2021 01:47 To: softerhardware/TeensyKeyerShield ***@***.***> Cc: K7MDL ***@***.***>; Author ***@***.***> Subject: Re: [softerhardware/TeensyKeyerShield] Add Battery Coin Cell Holder on PCB (Issue #1) Can you suggest some preferred part numbers and/or footprints? - You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fsofterhardware%2FTeensyKeyerShield%2Fissues%2F1%23issuecomment-954447665&data=04%7C01%7C%7C5a2a84536df849acbfea08d99a9f926c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637710832411397956%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=uilpByJzTicooXJEKe8ibARTLfe0CZu1WU53cL54pEg%3D&reserved=0>, or unsubscribe<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAPLVE7D4IGPYU6J77OOESPDUJIYOPANCNFSM5G6OAFHQ&data=04%7C01%7C%7C5a2a84536df849acbfea08d99a9f926c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637710832411407915%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=U4k1xJpDL%2F7qdvxwrbUF6YZiLml9iikXkLjT6ZWP2aY%3D&reserved=0>. Triage notifications on the go with GitHub Mobile for iOS<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fapps.apple.com%2Fapp%2Fapple-store%2Fid1477376905%3Fct%3Dnotification-email%26mt%3D8%26pt%3D524675&data=04%7C01%7C%7C5a2a84536df849acbfea08d99a9f926c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637710832411407915%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=SSI9%2FMc0HWQ3oZcAWncLJRQh0yaWdMxNNif%2FkBOcUtU%3D&reserved=0> or Android<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.github.android%26referrer%3Dutm_campaign%253Dnotification-email%2526utm_medium%253Demail%2526utm_source%253Dgithub&data=04%7C01%7C%7C5a2a84536df849acbfea08d99a9f926c%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637710832411417881%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=sTo7%2F1w%2B%2BFvEB%2BAsRL9lzy%2F3pnnRTkZqu%2FZV2STiVxU%3D&reserved=0>.

[softerhardware]

In the latest versions I am not connecting the Vbat (and any other pins that are not part of the "standard" pins installed teensy 4.0) to the PCB. Is it possible and reasonable to connect Vbat and ground via wires to the teensy 4.0 and then glue a horizontal battery holder to the underside of the "top panel" PCB.