「私のライフはまだ2.225e-308も残っている」

タイトルには深い意味はない。サクッと片付けようと思っていた測定機にまた別の問題が発生した。前の問題の原因はまだよくわからないが、今度のは光強度をGigEカメラで取ろうとしてるところに原因がありそうである。カメラ自身はダイナミックレンジは広くはないけどリニアリティは高くて、測定のための精度は十分のはずだった。が、そこに何かの合わせ技で問題が発生しているらしい。

ますます煮詰まるので、全然別の、以前工場にインストールした調整機に追加するための回路の半田付けをはじめた。夕方に半田付けし終わって基板単独で電源を入れて要所々々の電圧を当たってみるとちゃんとなっていた。これならOKだろうと思って40ピンのソケットにRaspberry Pi Zero WHをぷす、と差して/sys/class/gpioとかからチェックしようと、思った。

ブートしてしばらくするとなんだか香ばしい匂いがしてきた。昔よく嗅いだナイロン系の樹脂が溶ける匂い。最初どこからするのかわからなかったけど、Pi Zero WHの基板をさわるとあっちっちになってる。慌てて電源を抜いて、改めて基板を見直した。

最初わからなかったけど、何度目かで40ピンヘッダの17ピンにある3.3Vをグランドだと勘違いして配線していることに気がついた。その近くにはSPIの信号が出ていて、そこにA/Dコンバータのチップを繋いでいる。そのデジタルグランドを間違って3.3Vに接続していた。Pi Zeroを繋ぐ前は浮いていたからなんともなかったわけで、Pi Zeroを繋ぐと3.3VからA/Dコンバータのデジタルグランドを経由してチップ内部のアナロググランドへ電流が流れるというわけである。なんでこんなところに3.3Vなんか出てるんだよ、要らねえだろこんなもん、と八つ当たりした。

いかにも集中力が落ちてる、という証拠なので、もうそこで諦めて帰ってきた。明日やり直そう。昨日誰かが言ってた「悪魔は細部に宿る」．．．．
Pi Zeroを壊してたら悲しいなあ．．．．

コメント 2

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