diff --git a/sketch_apr29a/sketch_apr29a.ino b/sketch_apr29a/sketch_apr29a.ino
new file mode 100644
index 0000000..f376a4a
--- /dev/null
+++ b/sketch_apr29a/sketch_apr29a.ino
@@ -0,0 +1,18 @@
+#include <ModbusSerial.h>
+const int GPIOCoil = 0;
+
+bool coils[10];
+const int pinToRead = 2;
+
+ModbusSerial mb (Serial, 10);
+
+void setup() {
+  Serial.begin(9600);
+  pinMode(pinToRead, INPUT);
+  mb.addIsts(0);
+}
+
+void loop() {
+  mb.setIsts(0 digitalRead(pinToRead));
+  mb.task();
+}