diff --git a/voltmeters/calc/K.m b/voltmeters/calc/K.m
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--- /dev/null
+++ b/voltmeters/calc/K.m
@@ -0,0 +1,6 @@
+function [u dmax] = K(U, ADU)
+	adu = uint32(ADU);
+	U = uint32(bitshift(U*1000,17));
+	u = uint32(U/adu);
+	dmax = 2*uint32(2^31/u);
+endfunction
diff --git a/voltmeters/calc/Ux.m b/voltmeters/calc/Ux.m
new file mode 100644
index 0000000..a23e8e5
--- /dev/null
+++ b/voltmeters/calc/Ux.m
@@ -0,0 +1,6 @@
+function u = Ux(ADU, K)
+	adu = uint32(ADU);
+	adu *= K;
+	adu = bitshift(adu, -17);
+	u = uint32(adu);
+endfunction
diff --git a/voltmeters/kicad/5-digit/5digit_voltmeter.pdf b/voltmeters/kicad/5-digit/5digit_voltmeter.pdf
new file mode 100644
index 0000000..faebe6b
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diff --git a/voltmeters/kicad/5-digit/sch.png b/voltmeters/kicad/5-digit/sch.png
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index 0000000..51a9b4b
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