test TTL

Dependencies:   mbed TextLCD

Revision:
1:fd5a598caa32
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.lib	Thu May 23 14:39:11 2019 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/simon/code/TextLCD/#308d188a2d3a