seismograph challenge

docs/lessons/seismograph/challenge.md

@@ -5,7 +5,7 @@ Coding challenges for the seismograph.
 
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-Engineering: In this project, you will build your own seismograph micro:bit from tape and a household plate. 
+Engineering: In this project, you will build a remote control based on the seismograph micro:bit activity using a second micro:bit and micro USB cable. 
 
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