TTiny85 and Revers Polarity Protection
¿ªÔÆÌåÓýI think Oliver answered this perfectly but to reiterate¡ ? The Main board was designed so that when building it¡ you can select ONE of TWO options. ? OPTION 1:?? You can select the Reverse Polarity option¡ which is essentially the kit that Oliver and I are selling built into the Main board.? It does not allow reverse voltage to flow if you connect your radio backwards.? If you select this option, you CANNOT do option #2. ? OPTION 2:? This option is the soft-on-off approach to controlling the power to the radio.? Push the momentary contact button once and the radio comes on.? Then, later, push the button again momentarily and the power goes off¡ but before it does, it can run routines in the radio to do shutdown stuff¡ like put up a splash screen, save things you have selected to the memory card, etc.¡ then turn off¡ until the next push on again.? You don¡¯t get the reverse polarity protection of OPTION #1 using OPTION #2¡ BUT you CAN add one of our stand-alone reverse polarity kits and essentially get both for less than $10. ? The schematic show part positions for both options¡ and the BOM and build instructions have BLUE writing for one option and RED for the other.? The ATTiny85 is for OPTION #2 and was selected because it took up less board space than the flip-flops needed otherwise to do the same thing¡ and is programmable (!) for software timing and other things using its spare pins (like turning on and off the display at a different time¡ sequencing). ? ? ? ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Michael
Sent: Saturday, August 3, 2024 6:32 PM To: [email protected] Subject: [SoftwareControlledHamRadio] TTiny85 and Revers Polarity Protection ? Fellow ham and I are starting the main board consy. Following Dr. Bill's comprehensive instructions we are a little confused regarding the use of Reverse Polarity Protection along with the TTiny85. Option 3 states "...ATTiny85 was shipped with your V012 board sets. If you don't want to use this module, please populate the two parts shown in the blue box on the schematic and blue on the BOM..." Does this mean the TTiny85 provides Polarity Protection? I am thinking that if I don't want to use the TTINY85, then I should install the parts in red. Hope this makes sense ? |
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Michael, Please re-read Dr Bill's message carefully!? His final paragraph clearly states that Option #2 is implemented using the ATTiny85. Larry - AC8YE
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On Sunday, August 4th, 2024 at 6:52 PM, Michael <kg5umh@...> wrote:
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¿ªÔÆÌåÓýUm no.? You USE the ATTiny85 for OPTION #2.? You DON¡¯T use the ATTiny85 for OPTION #1.? That as easy as you can say it. ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ ? Owner - Operator Big Signal Ranch ¨C K9ZC Staunton, Illinois ? Owner ¨C Operator Villa Grand Piton ¨C J68HZ Soufriere, St. Lucia W.I. Rent it: ? Moderator: North American QRO Group at Groups.IO. Moderator: Amateur Radio Builders Group at Groups.IO. ? email:? bill@... ? ? From: [email protected] <[email protected]> On Behalf Of Michael
Sent: Sunday, August 4, 2024 5:52 PM To: [email protected] Subject: Re: [SoftwareControlledHamRadio] TTiny85 and Revers Polarity Protection ? Easier way to say it - If you want to use the TTINY85 do not do Options 1 or 2. ? Roger that! |
K9HZ
Larry - AC8YE