From d52fbe8537294e368c157e88ce19d4ed479b338c Mon Sep 17 00:00:00 2001
From: Sam Calisch <sam.calisch@cba.mit.edu>
Date: Mon, 10 Dec 2018 11:42:24 -0500
Subject: [PATCH] Update README.md

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index a7fc1ef..75ffb0f 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,8 @@ TODO
 
 <img src='img/assembly.jpg' height=400px>
 
+The brightness of the LEDs around the camera is set by a resistor value.  Unfortunately the circuit used by this SuperEyes microscope is quite sensitive to this value (higher resisistance is brighter, so it's like the the LEDs and resistor are in parallel, rather than series as is usual with current limiting resistors... not sure why).  I've found 330Kohm to be a good value for this.
+
 
 ### Alignment
 
-- 
GitLab