It is not confortable for assembling into a case that LCD&KEY shield is. I changed LCD to i2c LCD. As a result Arduino UNO is controlling all devices via i2c buss as a block diagram. I'm showing you i2c circuit of LCD mojule and key pad mojule.
As i2c LCD mojule is connecting with 4 wire cables, I could easily furnish it into case as next task.
最近RFワールドNo52を買って、nano VNAの取り扱いを勉強してみたので、その勢いをかってフロントエンドフィルターの特性をチェックし、特性改善テクニックを再現してみます。 Recently I bought the magazine of RF world for reading nano VNA articles. After then I had achieved experiment to measure junk parts dummys and homebrew dummys. With momentum I should try to check PCB pattern coil measurement.