diff --git a/doc/keybrd_library_user_guide.md b/doc/keybrd_library_user_guide.md
index 7ba0e3d..50b0aea 100644
--- a/doc/keybrd_library_user_guide.md
+++ b/doc/keybrd_library_user_guide.md
@@ -172,6 +172,11 @@ Development-environment items to check:
   Where 'KEY_A' could be any scan code.
   Fix this error from the Arduino IDE tool bar: Tools > USB Type > Keyboard + Mouse + Joystick
 
+* If last line in Arduino IDE says "Low memory available",
+  second-to-last line should say "leaving 100 bytes for local variables" or more bytes.
+* In keybrd/src/config_keybrd.h file, read_pins_t defaults to uint32_t.
+  If more memory is needed, 8-bit controllers can use uint8_t.
+
 Sketch items to check:
 * For each row, number of read pins in Row should equal number of keys.
 In this example, row_0 has 2 read pins and 2 keys:
diff --git a/src/config_keybrd.h b/src/config_keybrd.h
index 51d922b..6c191b4 100644
--- a/src/config_keybrd.h
+++ b/src/config_keybrd.h
@@ -13,9 +13,9 @@ Using smaller types on a 32-bit uC (Teensy LC) would accomplish nothing.
     For Scanner_ShiftRegs74HC165, Scanner_ShiftRegs74HC165::readPinCount
     For Scanner_Port, cover the last 1 bit in Scanner_Port::strobePin
 */
-//typedef uint8_t read_pins_t;
+typedef uint8_t read_pins_t;
 //typedef uint16_t read_pins_t;
-typedef uint32_t read_pins_t;
+//typedef uint32_t read_pins_t;
 
 /* SAMPLE_COUNT_MACRO is used in Debouncer_Samples.h
 SAMPLE_COUNT_MACRO = 4 is very reliable for a keyboard.