Companion Sheild
The entry level shield is labelled The Companion Shield. This is a PCB laid out in the pattern of a solderless breadboard. The holes are single sided, which means that components can easily be removed using solder mop braid, or a solder vacuum tool, if a mistake is made, or components need to be re-used.
The (PBP3) Companion Shield Manual iCan be downloaded from here
See the Companion Shield in our on-line shop
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Re: Erratic LED blinking
First thing that seems unusual to me is LCDOUT inside the ISR handler. That is something I would not do.
Jerson Today, 03:04Secondly, there is a statement if freq < 68 then freq = 136 followed by freq = freq/68. As...