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AT Coammnds for Staalplaat DTMF Thingy...
Use with SIMCOM 900 module
# Loudspeakerlevel 0 to 100
AT+CLVL=100
# 1 0 0 0 1
# 2 0 0 1 0
# 3 0 0 1 1
# 4 0 1 0 0
# 5 0 1 0 1
# 6 0 1 1 0
# 7 0 1 1 1
# 8 1 0 0 0
# 9 1 0 0 1
# 0 1 0 1 0
# * 1 0 1 1
# # 1 1 0 0
# A 1 1 0 1
# B 1 1 1 0
# C 1 1 1 1
# D 0 0 0 0
# Test DTMF
AT+CLDTMF=2,"5"
AT+CLDTMF=1,"1,2,3,4,5,6,7,8,9,0,*,#,A,B,C,D"